Part 2 of a CCNA study Guide available at 21certify.com
Q.51 Which of the following are true about connection-oriented network servers? (Choose two.)
A. Non-reliable
B. Reliable
C. Less bandwidth-intensive
D. Handshaking
Answer: B, D Explanation: Connection orientation connections are considered reliable as they ensure the deliver of data.
This is done through acknowledgements. Further when establishing a communication a three-way handshake is used.
Incorrect Answers:
A. Connection orientated communication is reliable.
C. Due to the acknowledgements connection orientated communications are very bandwidth intensive.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 29 – 30.
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Q.52 You have been hired as a consultant to troubleshoot the company’s network. You issue the debug ip rip
command to troubleshooting the rip network. You notice your Ethernet interface 10.1.0.0 shuts down. Which
update message is seen in your routers debug ip rip output regarding that network?
A. Subnet 10.1.0.0, metric 0
B. Subnet 10.1.0.0, metric 1
C. Subnet 10.1.0.0, metric 15
D. Subnet 10.1.0.0, metric 16
Answer: D Explanation: RIP (Routing Information Protocol) is a distance vector protocol. RIP uses hope counts as metric.
The designers of RIP believed that the protocol was unlikely to be practical for networks with a diameter larger than 15. The
maximum hop count is therefore set to 15. In RIP when a network in not reachable then its metric is changed to 16.
Incorrect Answers:
A: A metric of 0 denotes a directly connected route and indicates that the interface is up,.
B: This metric indicates that the interface is up and that the destination is reached with a hop count of 1.
C: This metric indicates that the interface is up and that the destination is reached with a hop count of 15.
RFC2453, RIP Version 2
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages
276 – 278.
Get Steves Book
Q.53 You have been assigned a class C network address. Your manager has asked to you create
30 subnets with at least 5 hosts per subnet for the different departments in your organization.
What should the subnet mask be to create 30 subnets?
Answer: 255.255.255.248 Explanation: We need 3 bits for the hosts (2^3-2=6 > 5). This would
provide for 30 subnets (2^5-2=30). A 29bit (24 + 5) network mask translates the 4th octet to 248
(=11111000 binary). The network mask used should be 255.255.255.248.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 225 – 226 and 236.
Q.54 Your manager is concerned about security on the subnet 10.0.1.0/24 that has the accounting
servers on it. He would like to make sure users can not telnet to those accounting servers and as
asked you to add a statement to your existing access-list to prevent users from accessing those
devices via telnet. Which one of the following statements should you enter?
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A. Access-list 15 deny tcp 10.0.1.0 255.255.255.0 eq telnet
B. Access-list 115 deny tcp any 10.0.1.0 eq telnet
C. Access-list 115 deny udp any 10.0.1.0 eq 23
D. Access-list 115 deny tcp any 10.0.1.0 0.0.0.255 eq 23
E. Access-list 15 deny telnet any 10.0.1.0 0.0.0.255 eq 23
Answer: D Explanation: We must use an extended access list. The correct answer is: Access-list 115
deny tcp any 10.0.1.0 0.0.0.255 eq 23 115 - the access-list number deny – the access list denies traffic
any – any source is allowed
10.0.1.0 0.0.0.255 – allows any destination with addressing with the pattern
10.0.1.x eq 23 – select the telnet port (TCP 23)
Note: Syntax extended access list.
access-list access-list-number [dynamic list-name [timeout value]] {deny | permit} protocol source
source-
wildcard destination destination-wildcard [precedence precedence] [tos tos] [log| log-input]
Incorrect Answers
A: We must specify both source (source + source wildcard) and destination (destination + destination
wildcard). Furthermore the mask is incorrect. The mask cannot be used as a subnet
mask. B, C: No destination wildcard is specified.
E: We cannot specify telnet as protocol. We specify it as a port with the eq 23 (or eq telnet)
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 304 – 306.
Q.55 You purchased a router from an online auction and you are unable to login to privileged
mode because the router has been configured with a password. You need to perform password
recovery. One of the first steps in performing password recovery is recording the current
configuration register setting from user mode. What is the command to view the configuration
register?
A. Show register.
B. Show flash.
C. Show boot.
D. Show version.
Answer: D Explanation:
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The show version command displays version information for the hardware and firmware. This
includes the register settings.
Incorrect Answers:
A: This is not a valid command.
B: The show flash command displays information in relation to router memory and image file.
C: The show boot IOS command displays the settings of the boot environment variables.
Reference: Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages
128-137. http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/1214ea1/3550cr/ccimtoc.htm
Q.56 What are the generic parts of a layer 3 address?
A. An internetnetwork number and a URL .
B. A vendor code and a serial number.
C. A network number and host number.
D. A broadcast number and unicast number.
E. A domain identifier and a device identifier.
Answer: C Explanation: The network layer address exists at Layer 3 of the OSI reference model.
These address are hierarchical in that they define networks first and then devices or nodes on each of the
networks.
Incorrect Answers:
A: A URL is used in the application layer, (HTTP).
B: This is describing a MAC address that is Layer 2.
D: This is not an addressing mode.
E: This is used in the application layer, Domain for DNS.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 20-29.
Q.57 There are some differences between routed and routing protocols. Which of the following
are examples of those differences? (Choose two.)
A. A routed protocol is assigned to an interface and determines the method of packet delivery.
B. A routing protocol determines the path of a packet through a network.
C. A routed protocol determines the path of a packet through a network.
D. A routing protocol operates at the transport layer of the OSI model.
E. A routed protocol updates the routing table of a router.
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Answer: A, B Explanation:
A: A routed protocol delivers data.
B: A routing protocol routes data.
Incorrect Answers C, E: A routed protocol only delivers data, it does not route data or update any
routing tables.
D: A routing protocol does not work at transport layer, layer 4. Many routing protocols work at layer
3, the network layer.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 254 – 255.
Q.58 Which show commands can you use to identify the local DLCI number? (Choose two.)
A. Show frame-relay local-dlci
B. Show frame-relay pvc
C. Show frame-relay dlci
D. Show frame-relay map
E. Show ip route
Answer: B, D Explanation:
B: The Show frame-relay pvc command is used to display statistics about PVCs for Frame Relay
interfaces. The statistical information include the DLCI number of the interface..
D: The show frame-relay map command displays the current map entries and information
about the connections. This information includes the DLCI number.
Incorrect Answers
A, C: There are no such commands.
E: The routing information, which is produced by the show ip route command, does not include
any DLCI number.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 422 – 423 and 280.
Q.59 When setting up Frame Relay for point-to-point subinterfaces, you enter the following
configuration:
Router(config)#int s0/0Router(config-if)#ip address 10.39.0.1
255.255.0.0Router(config-if)#encapsulation frame-relayRouter(config-if)#interface
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s0/0.39 point-to-pointRouter(config-if)#frame-relay interface-dlci 139Router(configif)#
exitRouter(config)#exitRouter#copy run start
Which of the following must not be configured?
A. The Frame Relay encapsulation on the physical interface.
B. The local DLCI on each subinterface.
C. An IP address on the physical interface.
D. The subinterface type as point-to-point.
Answer: C Explanation:
When setting up Frame Relay for point-to-point subinterfaces it is recommend that the network layer
address, the IP address, should be removed from the physical interface. The network layer address
should be configured to the subinterface instead.
Incorrect Answers:
A: When establishing a Frame Relay for point-to-point subinterfaces the Frame Relay
encapsulation on the physical interface must be configured.
B: When establishing a Frame Relay for point-to-point subinterfaces the local DLCI on each
subinterface must be configured.
D: When establishing a Frame Relay for point-to-point subinterfaces the subinterface must be
configured as point-to-point.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 427-429.
Q.60 What is an advantage of segmenting your LAN with a switch?
A. Smaller collision domains.
B. Elimination of broadcast.
C. Decrease cost of implementation.
D. Larger number of users within the same domain.
Answer: A Explanation:
By making more collision domains, each domain is smaller, resulting in fewer collisions, and thus an
advantage.
Incorrect Answers:
B: Broadcast still occurs on the segments, even with routers.
C: Due to extra hardware, or more advanced hardware, implementation is higher.
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D: By segmenting you are decreasing the number of users, thus reducing the number of
contenders for the medium.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 30-31.
Q.61 Your ISP has provided you the following class B network range 131.107.0.0/24. Which of the
following statements is true regarding this network? (Choose two.)
A. There are 254 usable hosts per subnet.
B. There is one usable network.
C. There are 255 usable hosts per subnet.
D. There are 254 usable subnets.
E. There are 30 usable subnets.
F. There are 62 usable hosts per subnet.
Answer: A, D Explanation:
A: There are 8 bits for the hosts (32-24). We use the formula 2^number_of_host_bits-2. So there are
254 hosts (2^8-2) per subnet.
D: There are 8 bits for the subnets (8 bits for hosts, 16 bits for the class B subnet: 32-8-16). Cisco
want us to use the formula 2^number_of_subnet_bits-2. This gives 254 (2^8-2) possible subnets.
Note: Cisco routers are able to use 256 subnets. In Microsoft exams the correct answer would be
that 256 subnets are available.
Incorrect Answers
B: According to Cisco there are two unusable networks namely 131.107.0.0/24 and 131.107.255.0/24.
C: Only 254 hosts are usable on each subnet. The lowest IP address in subnet is the subnet number. The
highest
address is the broadcast address. D, E: This
are incorrect as well.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 233 – 235.
Q.62 You just purchased a Cisco router from an online auction and now you have configured the
router and everything is working perfectly in your test lab. You then issue the command copy run
start to save your configuration to NVRAM. You turn off the power and mount the router in the
production rack. After connecting the power cord you power up the router and the router boots
into setup mode. You issue the show startup-config from privileged mode and your entire
configuration is there. Which of the following indicates a possible source of the problem?
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A. Hardware failure NVRAM prevents the router from loading the configuration.
B. Startup-config in flash is corrupt and cannot be analyzed.
C. Router configuration register set to bypass startup configuration.
D. Startup-config in NVRAM is corrupt and cannot be analyzed.
Answer: C Explanation: We must bypass the startup configuration and boot from ROM. This will
enable use to select a new user name and password which will enable us to access the router.
Basically we perform a password recovery procedure.
Reference: Password Recovery Procedure
http://www.cisco.com/warp/public/474/pswdrec_25
00.html
Q.63 Once you have defined interesting traffic with the dialer-list command, you then must
associate an ISDN phone number with the next hop router address. Which IOS command should
you use?
A. Isdn destination number.
B. Dialer map.
C. Isdn spid1.
D. Isdn line number.
Answer: B Explanation:
The dialer map command is used to define one or more dial-on-demand numbers to reach one or more
destinations for a particular interface. This is the exact command to associate an ISDN phone number
with the next hop router address.
Incorrect Answers:
A: This is not a valid command.
C: The isdn spid1 command specifies the SPID required for b channel to access the ISDN network
when your router makes its call to the local ISDN exchange.
D: This is not a valid command.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 397-406.
Q.64 You have just purchased a new Cisco router. Which mode should you use to create an initial
configuration on your router?
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A. Copy mode.
B. User mode.
C. Setup mode.
D. Startup mode.
Answer: C
Explanation:
If no configuration file exists for the router in NVRAM, the operating system executes a question driven
initial configuration routine often referred to as the system configuration dialog. This special mode is
also known as the setup dialog.
Incorrect Answers:
A: There is no copy mode
B: You can’t do configurations in user mode. The router only enters this mode when it has
already been configured.
D: There is a startup procedure but nor a startup mode.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 82-84.
Q.65 If RIP uses hop count to determine the best path what does IGRP use?
A. The highest metric value.
B. The lowest composite metric value.
C. The lowest hop-count and delay.
D. The highest bandwidth and reliability
E. The lowest administrative distance.
Answer: B
Explanation: IGRP calculates the metric by adding together weighted values of different characteristics
of the link to the network in question.
Incorrect Answers:
A. IGRP select the route with the lowest metric value as the best route.
C. Hop count is not one of the parts of the IGRP composite metric.
D. IGRP uses the lowest bandwidth value when selecting a path.
E. Administrative distance is not part of the IGRP composite metric.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 283 – 284.
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Q.66 Exhibit
You are network administrator for the network shown in the exhibit above. Adding the new
router, called TK2, the network has been augmented. You would like to backup the IOS image of
the new router to the TFTP server. However, the backup procedure fails.
What could be the cause of the problem?
A. Incorrect default gateway of the tftp server.
B. Incorrect subnet mask of the tftp server.
C. Incorrect IP address of the tftp server.
D. Incorrect IP address on E0 of the TK1 server.
E. Incorrect subnet mask on the TK2 router.
Answer: B Explanation: The subnet mask of the tftp server must match the subnet mask of the local
ethernet interface of the TK1 router.
Incorrect Answers
A: The default gateway of the TFTP server is the local e0 interface of TK1. This is the correct setting.
C: The IP address of the TFTP server is in the appropriate network range.
D: The IP address of the E0 interface of TK1 is in the appropriate network range.
E: The subnet mask of TK2 seems to be correct. It is the same as the subnet mask of the laptop client PC.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 237 – 239.
Q.67 Exhibit:
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Central Partial Configuration
isdn switch-type basic-niusername Remote password kinginterface bri0
ip address 10.1.1.1 255.255.255.0encapsulation pppppp authentication chapisdn
spid1 51055512360001isdn spid1 51055512360002dialer map ip 10.1.1.2 name
Remote1238001
dialer-list 1 protocol ip permit
Your company is using ISDN to connect the Remote office to the Central office. The connection is
not working between the two routers. You issue the show running-config command looking at the
configuration above. Which additional command must be issued on the Central router before
interesting traffic will be sent to the Remote router?
A. (config-if)# dialer-group 1
B. (config-if)# dialer-list 1
C. (config-if)# dialer map 1
D. (config-if)# dialer-route 1
Answer: A Explanation:
Once the above commands have been entered to enabled DDR, then the last step required is to bind the
traffic destination to an interface by linking the interesting traffic definition already created. This is
done with the dialer-group command. In this case the proper command would be (config-if)# dialergroup
1.
Incorrect Answers:
B: The interesting traffic was already identified the first time the dialer-list 1 command was used.
C: The dialer map command is used to identify the router to be dialed. In this case this has already been
done.
D: There is no such thing as a dialer route command.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 398-405.
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Q.68 What one of the following protocols is an example of a link state routing protocol that uses
the TCP/IP protocol stack?
A. IP
B. IS-IS
C. NLSP
D. OSPF
E. RIP ver 2
Answer: D Explanation: OSPF is a link-state protocol that can be used in routing that is part of the
TCP/IP protocol stack.
Incorrect Answers:
A: IP is a protocol, and a routed protocol, but NOT a routing protocol.
B: IS-IS is a routing algorithm used by the ISO protocol stack.
C: NLSP is part of the Novell protocol stack.
E: RIP (and RIP V2) are distance vector protocols.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 274-276, 215-216,
331, and 278.
Q.69 The default bandwidth of a high-speed serial link is 1.544 or T1. What is the correct
command to change the bandwidth of the interface to 64K?
A. Bandwidth 64
B. Band width 64
C. Bandwidth 64000
D. Band width 64000
E. Bandwidth 64K
Answer: A Explanation: The command is bandwidth and the parameter should specify the bandwidth
in kilobits.
Reference:
Incorrect Answers B, D: Incorrect command. Bandwidth is one word, not two.
C: This would be 64000kbps or 64Mbps.
E: Cannot use a parameter 64K.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 105 and 420.
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Q.70 Exhibit:
RouterA# show interface s0
Serial 0 is up, line protocol is down
Hardware is HD64570
Internet address 10.1.1.1
Encapsulation HDLC, loopback not set, keepalive set(10sec)
Router A is unable to connect to Router B, which is a Nortel router, through the network cloud.
Using the command output shown what must be configured on Router A's interface s0 to change
the line protocol from down to up?
A. No shutdown.
B. Encapsulation ppp.
C. Interface serial point-to-point.
D. Clock rate 56000.
Answer: B Explanation: To ensure that the line comes up the encapsulation type must be enabled.
This is done with the encapsulation ppp command.
Incorrect Answers:
A: The interface is already enabled therefore this command in not required.
C: The serial interface has already been created; this command would not solve the problem.
D: This will only set the clock rate and not bring solve the problem.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 381, 105, 432, and
407.
Q.71 What is one benefit of using a hierarchical addressing framework?
A. Increase availability of addresses.
B. Decrease distance between routers.
C. Increase router memory requirements.
D. No need to maintain routing information.
Answer: A Explanation:
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By partitioning the address ranges increases the availability of addresses. Instead of having one size fits
all, the address ranges are pooled into different sizes to satisfy different needs, and provides a better
distribution of addresses.
Incorrect Answers:
B: Hierarchical addressing will not affect the distance between routers.
C: Hierarchical addressing should DECREASE router memory requirements.
D: Routing information is needed because the adjacent networks are not sequential in line with the
current network, so a routing table is needed to know how to get to other networks.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 24-26.
Q.72 Frame relay has a feature that prevents PVCs from shutting down from lack of activity.
What is the name of this feature?
A. DLCI
B. BECN
C. FECN
D. LMI
E. CIR
F. De
Answer: D
Explanation: The keepalive command enables the keepalive sequence, which is part of the Local
Management Interface (LMI) protocol. The keepalives will prevent the PVC from shutting down.
Incorrect Answers:
A. The Data Link Connection Identifier (DLCI) is used for identification purposes and not to maintain
a connection.
B. BECN is not a LMI signaling standard. It stands for Backward Explicit Congestion Notification.
C. FECN is not a LMI signaling standard. It stands for Forward Explicit Congestion Notification.
D. CIR stands for Committed Information Rate. It does not maintain a connection.
E. DE will not maintain a connection.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 414 – 418.
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Q.73 Exhibit:
Frame Relay switch maps the DLCIs between Router A to Router B to create a PVC. Which
statement below correctly identifies the reference point between the local router and the Frame
Relay switch to which it is connected?
A. Locally significant DLCI
B. Globally significant DLCI
C. Locally significant LMI
D. Globally significant LMI
Answer: A Explanation:
The DLCI (Data-Link Connection Identifier) is a number that identifies the logical circuit between the
router and the Frame Relay switch. The Frame Relay switch maps the DLCIs between each pair of
routers to create a PVC. DLCIs have local significance in that the identifier references the point between
the local router and the Frame Relay switch, which it is connected.
Incorrect Answers:
B: As the DLCI are significant to just the two routers involved in the exchange of information it is not
proper o refer to globally significant DLCI.
C: Locally significant LMI is not the answer. LMIs are responsible for managing the connection
between the routers and not the assignment of numbers.
D: Globally significant LMI is not the answer. LMIs are responsible for managing the connection
between the routers and not the assignment of numbers.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 414-416.
Q.74 Novell Netware allows multiple Layer two frame structures. Cisco supports all of the frame
types. Cisco and Novell have assigned different names for the same encapsulation type. Which of
the following are correct matches of the Novell term to the equivalent Cisco IOS term for the same
framing types? (Choose two)
A. Ethernet_II-ARPA
B. Ethernet_802.3-SAP
C. Ethernet_802.2-LLLC
D. Ethernet_SNAP-SNAP
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Answer: A, D Explanation:
When you configure an IPX network, you might need to specify a non default encapsulation type either
on the Novell servers or on the Cisco router. Cisco and Novell have assigned a different name for the
same encapsulation type. It is imperative that the encapsulations are the same for both the Novell
equipment and the Cisco devices. Some of the encapsulation type pairings include:
Novell IPX Name Cisco Name Ethernet_802.3 novellether
Ethernet_802.2 sap Ethernet_II ARPA
Ethernet_SNAP snap
Incorrect Answers:
B: The proper pairing for 802.3 is novell-ether.
C: The proper pairing for 802.2 is sap.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 335-336.
Q.75 Consider Frame Relay multipoint subinterfaces. Which is a valid statement?
A. An IP address is required on the physical interface of the central router.
B. All routers are required to be fully meshed.
C. All routers must be in the same subnet to forward routing updates and broadcasts.
D. Multipoint is the default configuration for Frame Relay subinterfaces.
Answer: C Explanation: All routers must be in the same subnet to forward routing
updates and broadcasts.
Incorrect Answers
A: An IP address is required for each subinterface. An IP address is not required for the physical
interface.
B: Routers are not required to be fully meshed.
D: You are required to select either the multipoint or point-to-point parameter; there is no default.
Q.76 Encapsulation is the method of passing data down the stack of the OSI model and adding
headers and trailers. Which one of the following shows the correct order of Data Encapsulation?
A. Data, Packet, Segment, Frame.
B. Segment, Data, Packet, Frame.
C. Data, Segment, Packet, Frame.
D. Packet, Data, Segment, frame.
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Answer: C. Explanation: Data encapsulation is a process in which information is wrapped in the data
section of another protocol. In the OSI model each layer encapsulates the layer immediately above as the
data flows down the protocol stack. The order of encapsulation is
1. 1. Application/Presentation/Session DATA
2. 2. Transport SEGMENT
3. 3. Network PACKET
4. 4. Data Link FRAMES
5. 5. Physical BITS
Incorrect Answers:
A: With Data, Packet, Segment, Frame; packet and segment are inverted.
B: With Segment, Data, Packet, Frame; data and segment are inverted.
D: With Packet, Data, Segment, frame; the only information package in the proper order is frame.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) page 13.
Q.77 The ICMP ping used for troubleshooting a network can be used on a Cisco router in which
modes? (Choose two)
A. User.
B. Privileged.
C. Global Configuration.
D. Interface Configuration.
Answer: A, B Explanation: The ping command is used to check network and host reachability. The
ping command can be used at both the privileged exec mode and the user exec mode.
Incorrect Answers:
C: The global configuration mode can be used to configure global parameters of the device. The ping
command cannot be used in this mode.
D: The interface configuration mode is used to configure a specific interface. The ping command
cannot be used in this mode.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 99
and 167. http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1902.htm
Q.78 The advanced editing features are turn on by default on Cisco routers. To turn off these
features you enter the command terminal no editing. With the advanced editing features turned
on what is the effect of Ctrl-Z?
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A. Exits back to privileged exec mode.
B. Disconnects from the router.
C. Aborts the ping operation.
D. Exits privileged exec mode.
Answer: A Explanation: Ctrl-Z exits back to privileged exec
mode (enable mode).
Incorrect Answers:
B. To end a terminal connection you will need to use the logo command to log off of a router.
C. Ctrl Z will not disable the ping command. An Access List could be used to prevent ping from
functioning.
D. You would need to enter Ctrl Z one more time to exit the privileged exec mode.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 89 – 97.
Q.79 A soft drink company has made the decision to provide 3 branches with network
connectivity. There is a LAN in each branch. The Vanilla and Chocolate routers are fully
configured. The Plain router is almost fully configured. However, it does not have the routing
protocol configured. Configure the routing protocol and publish all networks on the Plain router.
The configurations of the routers are as follows:
. The routers are named Vanilla, Chocolate, and Plain.
. RIP is the routing protocol used.
. The clocking is provided on the serial 0 interface.
. The password on the Plain router is “21certify”
. The default subnet mask is used on all interfaces
. The IP addresses are listed below.
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Start by clicking on host that is connected to the router you want to configure.
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Explanation:
< Click on Host6, which is connected to the Lab 3 router>
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Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 277 – 279 and 133.
Q.80 Exhibit:
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Novell IPX addressing uses a two-part address that consists of 32 bits for the network number and
48 bits for the node number. What is the node number/layer 2 address as shown in the output of
the show ipx interface e0 command?
A. 6F2C
B. 0000.0c
C. 5d.b35e
D. 0c5d.b363
E. 0000.0c5d.b363
F. 6F2C.0000.0c5d.b363
Answer: E Explanation:
An IPX address is composed of two parts: the network number and the node number. For IPX the node
number is usually obtain from MAC address of the network interface. In this case the network number
is 6F2C and the node number/MAC address is 0000.0c5d.b363
Incorrect Answers:
A: 6F2C is the network number, which is a layer 3 address.
B: This only part of the MAC address thus incorrect.
C: This only part of the MAC address thus incorrect.
D: This only part of the MAC address thus incorrect.
F: This is the IPX address. As stated previously this address is part layer 3 and part layer 2.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 332 and 345-6.
Q.81 Using the following address and subnet mask 195.106.14.0/24 what is the total number of
networks and the total number of host per network?
A. 1 network with 254 hosts.
B. 2 networks with 128 hosts.
C. 4 networks with 64 hosts.
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D. 6 networks with 30 hosts.
Answer: A
Explanation: As the last octet is for host addresses, the maximum number networks is 1 to determine
the
number of host use the formula (2^8) – 2. That is 256-2=254.
Incorrect Answers:
B and C: These combinations of networks and hosts are not possible.
D: This would require a subnet mask of 255.255.255.224.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) page 236.
Wendell Odom. Cisco CCNA Exam #640-507 Certification Guide. (Cisco Press: 2000)
page 238.
Q.82 Which wide area network technology was designed to work with traditional POTS lines and
provide SOHO’s and users with a higher speed digital dial-up service?
A. Frame relay
B. X.25
C. ATM
D. ISDN
Answer: D Explanation: Compared to analog modems, ISDN provides a digital service with faster
connection times and somewhat higher speeds.
Note: POTS= plain old telephone system. SOHO= small office/home office networks
Incorrect Answers:
A. Frame relay is used to handle multiple virtual circuits.
B. X.25 defines how the connections between DTE and DCE are maintained.
C. ATM was designed to take advantage of the speeds offer by media such as E3 and T3.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 387 – 389 and 373.
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Q.83 One of the best ways to understand how to build a network is to understand the method in
which traffic is passed across the network. One of the reasons the OSI model was created to help
you understand how a network operates. Which three devices operate at all seven layers of the
OSI model? (Choose three.)
A. Network host
B. Network management station
C. Transceiver
D. Bridge
E. Web server
F. Switch
Answer: A, B, E Explanation: The three devices that operate at all seven layers of the OSI model
are network hosts, network management station and web server. This is how these devices are able
to perform their functions.
Incorrect Answers:
C: A transceiver is not used in a network environment.
D: A bridge is a Layer 2 device.
F: A switch is a Layer 2 device.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 21-22.
Q.84 Which of the following are functions that occur at the transport layer of the OSI model?
(Choose three)
A. Route selection-IP
B. Sliding window-UDP
C. Well known ports-IP
D. Route validation-ICMP
E. Connection oriented-TCP/IP
F. Three way handshake TCP/IP
G. No acknowledgement-UDP
Answer: E, F, G Explanation: The key to answering this question is the difference between
connection and connectionless protocols. TCP is a connection orientated protocol that us a threeway
handshake to establish a connection. UDP is a connectionless protocol that does not guarantee
delivery therefore there is no acknowledgements.
Incorrect Answers:
A: Route selection and IP are network layer, not transport layer functions.
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B: Sliding windows is used in connection oriented, and UDP is connectionless.
C: Well-known ports are functions of UDP & TCP.
D: ICMP, which is used for the ping command, does not validate routes.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 28-30.
Q.85 Which wide are network technology was designed to use high-performance digital lines and
is packet switched?
A. FDDI
B. ISDN
C. ATM
D. Frame Relay
Answer: D
Explanation: Frame Relay is a packet switching technology that uses
digital lines.
Incorrect Answers
A: FDDI is a topology.
B: ISDN is not a packet switched service.
C: ATM is a broadband technology.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 373 – 374.
Q.86 IP addresses use hierarchical numbering. What portion of the address that will identify the
network number?
A. Subnet Mask.
B. Dots between octets.
C. Class of first octet.
D. Assignments of DHCP.
E. Address Resolution Protocol.
Answer: C.
Explanation:
In general, IP addresses contain two fields: one for the network and another for host. Class A address
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have a range of 1 to 126 and the network portion of the IP address is restricted to the first eight bits
(octet). Class B address have a range of 128 –191.255.0.0 and the network portion of the IP address is
contain in the first 2 octets. Class C IP addresses has a range of 192.223.255.255.0 and the network
portion of the IP addresses is the first three octets of the IP address. Class D addresses include the range
of 224.0.0.0 to 239.255.255.255 and are used for multicast address. Class E addresses have a range of
224.0.0.0 to 247.255.255.255 and are reserved for experimental purposes.
Incorrect Answers:
A: Although the subnet mask is used network devices to determine what part of the IP use
address for the network, the subnet and the host address but it is not part of the IP address
hierarchy.
B: The dots are used for making the IP address readable by humans, but have no determination of the
network number.
D: DHCP (Dynamic Host Configuration Protocol) provides a mechanism for allocating IP
addresses dynamically so that addresses can be reused when hosts no longer need them.
E: Address Resolution Protocol (ARP) determines the data link layer address of the destination
devices for known destination IP addresses network number.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 215-227.
Q.87 Looking at this address 255.255.255.255 which one of the following is true?
A. IP, a flooded broadcast.
B. IP, a directed broadcast.
C. IPX, a flooded broadcast.
D. IPX, a remote directed broadcast.
Answer: A
Explanation: Flooded broadcast (255.255.255.255) are not propagate and are considered local and are
sent to every host on the network.
Incorrect Answers:
B: The IP identified is not directed broadcast. Direct broadcast use the IP of the network
C and D: 255.255.255.255 is an IP address, not an IPX address.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 231-233.
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Q.88 Using a protocol analyzer you determine your LAN traffic is experiencing congestion. What
could be some possible causes for a congested network? (Choose four.)
A. Too many hosts in a broadcast domain.
B. Full Duplex operation.
C. Broadcast storms.
D. Multicasting.
E. Segmentation.
F. Low bandwidth.
Answer: A, C, D, F
Explanation:
A: Too many hosts in a broadcast domain would cause many collisions and congestion.
C: Broadcast storms would have a negative impact on available bandwidth.
D: Multicasting targets multiple destinations and requires a lot of bandwidth.
F: Low available bandwidth would of course result in a congested network faster than a network with
higher bandwidth.
Incorrect Answers
B: Full duplex operation would decrease congestion.
E: Segmentation decreases the collisions domains, the network traffic, and the congestion.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 150 –152 and 16 –
23.
Q.89 RouterA is directly connected to RouterB. On RouterA you shutdown the interface that is
going to RouterB (you put it administratively down). If you issue the command show interface
on RouterB what output status would you see on the interface that is connected to RouterA?
A. Interface is down, line protocol is down.
B. Interface is down, line protocol is up.
C. Interface is up, line protocol is down.
D. Interface is up, line protocol is up.
Answer: A
Explanation: The line protocol would be down, and the interface would be down. The first part of the
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result will indicate whether the interface hardware is active or not. As you put the interface
administratively down the interface will be down. The line protocol result indicates whether the process
believes that interface is usable or not. If three keepalives are missed protocol will be marked as down.
Incorrect Answers:
B. It can be assumed that the three keepalives have been missed and thus the line protocol would
be done. C and D. You put the interface administratively down as a result the interface would be
down.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 106 – 109.
Q.90 Which layer of the OSI model handles data translation, code formatting, and encryption
occur?
A. Physical
B. Data link
C. Network
D. Transport
E. Session
F. Presentation
Answer: F
Explanation:
The presentation layer provides a variety of coding and conversion functions that are applied to
application level data. These functions ensure that the data sent from the application layer of one
system can be read the application layer of another system.
Incorrect Answers:
A: The physical layer is what puts the actual data onto the wire.
B: The data link layer is involved in converting bits into bytes, converting bytes into frames and
with error detection.
C: The network layer provides logical addressing so that routers can perform route determination.
D: The transport layer provides delivery of the data and error correction prior to retransmit.
E: The session layer is responsible for establishing, managing, and terminating communications
sessions between presentation layer entities.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 11-12.
Q.91 Using a class C address you need five subnets with a maximum of 17 hosts on each of these
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subnets. Which subnet mask would you use?
A. 255.255.255.192
B. 255.255.255.224
C. 255.255.255.240
D. 255.255.255.248
Answer: B
Explanation: 255.255.255.224 will support the configuration.
For 5 networks, we need a minimum of 3 bits. We get this in the following way: Add two to the
requirement,
then round up to the next power of 2. So, we get 5+2=7, next highest is 8, because 2 to the 3rd power is 8.
Thus
3 bits.
For 17 hosts, we do the same thing, we get 17+2=19, next highest is 32, which is 5 bits, 2 to the 5th
power is 32.
Now 3 bits network and 5 bits host make an octet. For a subnet mask, 3 bits are 128+64+32 = 224.
Incorrect Answers:
A: This supports too many hosts and not enough networks C and D: They support too few hosts and too
many networks.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 230-236.
Q.92 What is the protocol and what is the second part of the following network address? (Choose
all that apply.)
10.0.0.254 mask 255.0.0.0
A. IPX MAX address.
B. IP Class C director broadcast.
C. Private IP address node number.
D. Public IP address directed broadcast.
E. Private IP address directed broadcast.
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Answer: C Explanation: The Internet Assigned Numbers Authority (IANA) has reserved the following
three blocks of the IP address space for private Internets:
10.0.0.0 -10.255.255.255 (10/8 prefix)
172.16.0.0 -172.31.255.255 (172.16/12 prefix)
192.168.0.0 -192.168.255.255 (192.168/16 prefix)
Remember all three ranges!
Reference: RFC 1918, Address Allocation for Private Internets
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 194.
Q.93 There are five different types of IP address classes. What IP address class is used for
multicasting?
A. A
B. B
C. C
D. D
E. E
Answer: D Explanation: Multicasting is possible due to Class D IP addresses. Class D address
range is 224.0.0.0 to 239.255.255.255.
Incorrect Answers:
A. Class A addresses are not used for multicasting.
B. Class B addresses are not used for multicasting.
C. Class C addresses are not used for multicasting.
E. Class E addresses are for research purposes.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 223 – 224.
Q.94 Which layer of the OSI model uses packets as the PDU (Protocol Data Unit)?
A. Data link
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B. Session
C. Presentation
D. Network
E. Transport
Answer: D Explanation:
The packet is the encapsulation type of the Network layer.
Incorrect Answers:
A: The data unit of the data link layer is the frame.
B: The session layer in not involved in the data encapsulation process.
C: The presentation layer ensures that the receiving system can read the data and is not
involved in encapsulation.
E: The transport layer data unit is the segment.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 11-13.
Q.95 Cisco supports IPX traffic using different encapsulation types can go over the same interface.
A. TRUE
B. FALSE
Answer: A Explanation:
Multiple encapsulations can be specified on an interface, but only if multiple network numbers have also
been assigned, where each network number belongs to only one encapsulation type and each
encapsulation type has only one network number. Although several encapsulation types can share the
same interface, clients and servers with different encapsulation types cannot communicate directly with
each other.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) page 335.
Q.96 What must you do to test connectivity on a dial on demand routing (DDR) link?
A. Increate the idle import parameter.
B. Send interesting traffic across the link.
C. Switch
D. Repeater
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Answer: B Explanation: To test DDR connectivity you will need to send interesting
traffic across the link.
Incorrect Answers:
A. This will not have the desired result.
C and D. These devices will not allow you to test connectivity.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 400 – 406.
Q.97 Your company is considering purchasing a new accounting software application from ABC
accounting company. The ABC accounting company has decided to come in and let you install a
demo copy of their software so that you can test it in your network with a few hosts. The server
and the hosts that will connect to this server will need a 10Mbps connection. Your company is
currently using a hub. Your company has decided to use this new accounting software application.
However when you ran your packet analyzer you noticed the rest of the hosts on your network
that are not using this application have a bandwidth problem with the new accounting system
installed. Since your company has decided to use this new application they would like you to
resolve the bandwidth problem. What is the most economical decision would you implement for
resolving this problem?
A. Install new 100 Mbps switches, and change all hosts’ NIC to 100 Mbps.
B. Segment network with router, and place all testing hosts and the new server into a separate
subnet (network).
C.Add a Bridge and separate the two networks.
Answer: B Explanation: A router helps in creating more broadcast domains and decreasing the
scope of each broadcast domain. This will improve network utilization.
Incorrect Answers
A: A switch would increase the number of collision domains and decrease the scope of each collision
domain. However, the broadcast domain would still be the same.
C: This would only give two collision domains. A switch would provide more collision domains.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 16 – 17.
Q.98 What are the benefits of replacing a hub with a bridge and segmenting the network?
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A. It increases the number of collision domains.
B. It decreases the number of collision domains.
C. It increases the number of broadcast domains.
D. It decreases the number of broadcast domains.
Answer: A. Explanation:
Bridge networks have the following characteristics: each segment has its own collision domain, all
connected devices are part of the same broadcast domain, and all segments must have the same data link
layer implementation.
Incorrect Answers:
B: When a network is segmented by a bridge the collisions domains increase and not
decrease. C and D: The addition of a bridge to a network has no effect on the number
of domains.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 23-4.
Q.99 To govern the flow of data between two devices, TCP uses a flow control mechanism. Which
one of the following is true about this mechanism?
A. TCP makes no effort to check for lost or duplicate data packets.
B. The application layer must sequence data packets when using TCP.
C. TCP controls the flow of UDP data through negative acknowledgements NAK.
D. TCP is a connection-oriented protocol that acknowledges receipt of data packets and is
considered reliable.
Answer: D Explanation: Connection oriented protocols are reliable as the usually acknowledge the
receipt of data packets. TCP is connection oriented.
Incorrect Answers:
A: TCP is connection oriented and guarantees packet delivery and order.
B: TCP is connection oriented, and guarantees packet ordering
C: TCP does not mix with UDP, a different transport protocol.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 29 and 207.
Q.100 Your company has decided to use IGRP instead of RIP as the routing protocol. They want
to use autonomous system number 130. Which is the correct command for this installation?
A. Router(config)# igrp 130
B. Router(config)# network 130
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C. Router(config)# router igrp 130
D. Router(config)# enable igrp 130
Answer: C Explanation: To enable IGRP as a routing process one uses the router igrp command. This
command must include the AS number within it. Thus the command to set IGPR for AS 130 is:
router igrp 130
Incorrect Answers:
A: Igrp 100 is not a valid command.
B: The network command it used to identify what network the AS is directly connected to. In this case
(network 100) the command is wrong as it contain the AS number and not the network number.
D: The enable command is used for entering privilege mode. Further the enable command does not use
the AS number.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 285-286 and 69.
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