CCNA 2 - Module 9

1

After issuing the command traceroute 192.168.4.2 from Router A, the following information is returned

Tracing the route to Router_D (192.168.4.2)
1 Router_B (192.168.2.2) 16 msec 16 msec 16 msec
2 * * *
3 * * *

What can be concluded about the network shown in the graphic based on the output given?
• Network 192.168.5.0 is missing from the routing table on Router
• There is a problem with the connection between Router B and Router C.
• Router C is not running CDP.
• Some of the routers are non-Cisco devices.
• Router B was not able to return ICMP TEMs to Router A

2 Which of the following would be the default administrative distance of a static IP route that references the IP address of the next hop?
• 0
• 1
• 5
• 20

3 After issuing the show interfaces command, a technician notices the line "Serial1 is down, line protocol is down" in the output. Which of the following are possible reasons for this message output? (Choose three.)
• There is a mismatch in the encapsulation type on both ends of the link.
• A Layer 1 issue exists.
• An interface problem exists.
• The clockrate was not set during configuration.
• There is no usable media for the protocol.
• Keepalive messages are not being sent.

4 Which three correctly pair a routing metric with its description? (Choose three.)
• hop count - the number of routers traversed to reach a destination
• bandwidth - the amount of time it takes a packet to travel a link
• load - the amount of activity on a link
• delay - the link speed
• reliability - the error rate on a link

5

When issuing the show interfaces serial1 command, a network administrator receives the output shown in the graphic. What are the possible causes of an increase in the number of input errors? (Choose three.)
• There could be Layer 3 addressing problems.
• There could be a problem with faulty telephone equipment.
• The router hardware could be defective.
• There is an incorrectly configured encapsulation on the interface.
• There could be a problem with the cabling.

6 Which ICMP message type notifies source hosts that a receiving host or network is not available?
• time exceeded
• redirect
• destination unreachable
• source quench
• parameter problem
• echo reply

7 The show interfaces command provides line and protocol status information. Which of the following conditions would never occur in the output of this command?
• serial1 is up, line protocol is up
• serial1 is up, line protocol is down
• serial1 is down, line protocol is down
• serial1 is down, line protocol is up
• serial1 is administratively down, line protocol is down

8

The network administrator shown in the exhibit can ping the E0 interface of the HAR router, but the telnet intranet.xyz.com command issued from the administrator's workstation fails to open a session with the intranet.xyz.com server. What are two possible causes of this problem? (Choose two.)
• upper-layer application problems
• domain name system problems
• IP addressing problems on the HAR router
• clock rate problems on the HAR router serial interface
• ICMP connectivity problems

9 The network administrator is using a PC to access a router via the router console port. Both the PC and the router are powered on and a cable has been connected between them. However, a session cannot be established. Which steps might fix this problem? (Choose two.)
• Verify the cable is properly connected at each end.
• Reseat the network card in the PC.
• Verify the cable is the correct type.
• Verify that a password has been set on the console line.
• Check the transceiver for link lights.
• Reseat the console card on the router

10 Which command will display routing table information about all known networks and subnetworks?
• Router# show ip interfaces
• Router# show ip connections
• Router# show ip route
• Router# show ip networks

11 A network technician has discovered that a router in the network can no longer be reached. The technician attempts to verify Layer 1 functionality, but is unable to physically inspect the cables. Which command can be used to determine the type of cable connected to the router?
• Router# show interfaces
• Router# show controllers serial
• Router# show ip route
• Router# show ip protocol
• Router# show version
• Router# show running-config

12 During the lookup process when forwarding a packet, a router checks its routing table for the best path to the destination. If a route has an administrative distance of 0, what does this indicate to the router?
• The packet should be discarded.
• The destination is unreachable.
• The destination is a directly connected network.
• The source of the update for that route is unreliable.

13 Which command will verify the functionality of all seven layers of the OSI model on a network host?
• ping
• debug
• telnet
• traceroute

14

After issuing the show interfaces serial1 command, an administrator notices an increasing number of carrier transitions. What are the possible causes for this increase? (Choose two.)
•There is an incorrect encapsulation configured on the interface.
•There could be an interruption in the line by the service provider.
•There is a faulty switch or CSU/DSU.
•There is noise on the serial line.

15

Consider the RIP network shown in the diagram. Which entries would be listed in the routing table of Router A?
• R 192.168.5.2[120/1] via 192.168.15.0, 00:00:09, Serial0
• R 192.168.15.0[120/1] via 192.168.5.2, 00:00:13, Serial1
• R 192.168.15.0[120/1] via 192.168.5.1, 00:00:13, Serial0
• R 192.168.5.1 [120/1] via 192.168.5.2 00:00:29, Serial1
R 192.168.15.0 [120/1] via 192.168.5.2, 00:00:29, Serial1
• R 192.168.5.1 [120/1] via 192.168.5.2 00:00:18, Serial0
R 192.168.15.2 [120/1] via 192.168.5.2, 00:00:18, Serial

16 Which items would be displayed when the show ip protocols command is executed? (Choose three.)
• sources of routing updates
• networks being advertised
• routing protocol up or down
• configured routed protocols
• Layer 2 status of the interface
• update timer values

17 Which two are true regarding the debug commands? (Choose two.)
• Debug commands may be issued from the user EXEC prompt.
• The command undebug all will turn off all debug operations.
• By default, the router sends the debug output and messages to the telnet session.
• The high processor overhead incurred using debug may disrupt normal router operation.
• The debug all command provides a summary view of router activity and can be used frequently for troubleshooting.
• The show debugging command will display current events such as traffic on an interface and error messages generated by nodes on the network.

18 A network administrator suspects that a network is not being included in the routing updates. Which command will provide information on when the next update is due and which networks are advertised in the update?
• Router# show interfaces
• Router# show controllers serial
• Router# show ip protocols
• Router# show ip route
• Router# show running-config

19 Which of the following is a problem at the physical layer of the OSI model?
• incorrect file formatting
• incorrect encapsulation on a serial interface
• incorrect routing protocol
• incorrect cable type

20

When the show cdp neighbors command is issued from Router C, which devices will be displayed in the output?
• D, SWH-2
• A, B, D
• SWH-1, SWH-2
• B, D
• SWH-1, A, B
• A, B, D, SWH-1, SWH-2

21 Which of the following are advantages of using a static route? (Choose three.)
• secure operation
• highly adaptable
• low maintenance configuration
• low processor overhead
• precise control of path selection

22 Which of the following commands can be used to statically configure default routes? (Choose two.)
• ip static-route
• ip route
• ip network-route
• ip default-network
• ip default-static

23 Why does a router build a routing table? (Choose two.)
• to list available routes for forwarding data
• to map local Layer 2 addresses to the remote Layer 3 destination address
• to dynamically send periodic updates regarding the router's status
• to prevent routing loops when redundant links are added to the network
• to select the best path to a destination

24 Which of the following lines from the show interfaces output would indicate a Layer 2 problem?
• Serial1 is up, line protocol is up.
• Serial1 is up, line protocol is down.
• Serial1 is down, line protocol is down.
• Serial1 is administratively down, line protocol is down.

CCNA 2 - Module 8

1 How does a source host use ICMP to confirm that a destination host is reachable?
• The source host sends an ICMP echo request to the destination router which responds with an ICMP echo reply confirming the reachability of the destination host.
• The source host sends a data packet and receives an ICMP host unreachable packet from the destination host if the data packet cannot be delivered.
• The source host sends an ICMP packet with a TTL value of 1 and receives an ICMP reply with a TTL value of 0 from the destination host.
• The source host sends an ICMP echo request and receives an ICMP echo reply from the destination host.

2 Which type of message is generated by a host when the ping command is entered?
• ICMP echo request
• ICMP echo reply
• UDP echo request
• UDP error message

3 Which of the following start the test of destination reachability?
• echo request issued by source
• echo reply issued by source
• echo request issued by destination
• echo reply issued by destination

4 Which two statements are true regarding ICMP? (Choose two.)
• ICMP provides reliability for the TCP/IP protocol stack.
• ICMP is a component of the TCP/IP protocol stack.
• ICMP notifies the sender that data transmission errors have occurred.
• ICMP is connection-oriented.
• ICMP messages are propagated to all intermediate devices.

5 How does ICMP improve data transfer reliability in IP networks?
• Each router in the path reads ICMP packets and uses the information to update routing tables.
• ICMP can correct many network problems as they occur.
• ICMP error messages are returned to the sending device when a packet is dropped by a router.
• ICMP packets report the intermediary devices that a packet passed through before failure occurred.

6 Which layer protocols provide reliability for IP when needed?
• ICMP and ping
• RIP and TTL
• upper layer protocols
• lower layer protocols
• Internet layer protocols
• network access layer protocols

7 Which devices along a data transmission path are notified by ICMP when delivery failures occur?
• source devices only
• destination devices only
• intermediary devices
• source and destination devices
• source, intermediary, and destination devices

8 When a datagram is processed by a router on the path from source to destination, what happens to the value in the TTL field?"
• It is increased by one.
• It is decreased by one.
• It stays the same.
• It is reset to 0.
• Nothing.

9 Which condition could cause a fragmentation needed ICMP destination unreachable message to be sent?
• A low bandwidth WAN link has become congested with IP traffic.
• A packet is forwarded from a Token Ring network to an Ethernet network.
• A network is not reachable because of faulty routing information.
• The address specified by the sending host is nonexistent.

10

Workstation 1 sent a data packet to Workstation 4. It never arrived because Fa0/0 interface went down on Router C. How will the devices handle this failure?
• Workstation 4 will send an error message to Router C and Workstation 1 that it did not receive the packet.
• Router C will use ICMP to send a message back to Workstation 1 indicating that the packet could not be delivered.
• Router C discards the packet without providing notification to any device.
• Router C uses ICMP to correct the failure and transmits the data to Workstation 4.
• Workstation 1 will use ICMP to correct the problem and then notify Router C to continue the transmission.

11 Which three conditions must be met in order for host to host communication over an internetwork to occur on IP networks? (Choose three.)
• The routing protocols configured on the source and destination networks must be the same.
• A default gateway must be properly configured on the hosts and local networks.
• Intermediary devices, such as routers, must be present on the network and have knowledge of how to reach the destination network.
• The source and destination host subnet masks must match.
• The IP addresses of the hosts must be in the same network or subnet as their respective gateway devices.

CCNA 2 - Module 7

1 Which command or set of commands will stop the RIP routing process?
• RouterB(config)# router rip
RouterB(config-router)# shutdown
• RouterB(config)# router rip
RouterB(config-router)# network no 192.168.2.0
• RouterB(config)# no router rip
• RouterB(config)# router no rip

2 When does a distance vector routing protocol set a hold-down timer on a route?
• when the metric value of the route decreases
• when the route is marked as inaccessible
• when the metric value for the route improves
• when a regular update is received from a neighboring router

3 Which of the following functions are performed by a router as routing information travels through the network? (Choose two.)
• advertise supported applications
• identify new destinations
• calculate packet speed
• verify network scalability
• identify invalid networks

4 What do distance vector algorithms require each router in the network to send?
• a partial routing table to each router in the LAN
• a partial routing table to each router in the WAN
• the entire routing table to each neighboring router
• the entire routing table to each router in the autonomous system

5

What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)
• RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA.
• During the next update interval, RouterB will send a RIP update out both ports that includes the inaccessible network.
• During the next update interval, RouterC will send an update to RouterB stating that network 114.125.16.0 is accessible in 2 hops.
• Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.
• RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterC.

6

Refer to the exhibit. Assuming default settings are configured, which routing protocol has been configured on the router?
• OSPF
• RIP
• EIGRP
• BGP
• Static

7 Which command will display RIP activity as it occurs on a router?
• debug ip rip
• show ip route
• show ip interface
• show ip protocols
• debug ip rip config
• show ip rip database

8 Which of the following methods does split horizon use to reduce incorrect routing information?
• Routing updates are split in half to reduce the update time.
• Information learned from one source is not distributed back to that source.
• New route information must be learned from multiple sources to be accepted.
• The time between updates is split in half to speed convergence.
• New route information is suppressed until the system has converged.

9

According to the router output from the show ip route command shown above, which of the following statements are true? (Choose two.)
• The metric to network 192.168.8.0 is 24.
• The hop count to a device on network 192.168.8.0 is 2.
• The total path cost to network 192.168.4.0 is the default value of 16.
• The logical address of the next router for network 192.168.1.0 is 192.168.3.1.
• The devices on network 192.168.5.0 cannot be reached as indicated by the 'C' label.

10 How would an administrator configure a static route for use if a primary route failed?
• configure the route with a metric greater than the default value
• configure the route and the router will activate it as needed
• configure the route to activate by using the redistribute static command
• configure the route with an administrative distance greater than the default value

11 Which statements describe RIP? (Choose three.)
• The maximum metric value is 255 hops.
• The maximum metric value is 15 hops.
• Routing updates occur every 30 seconds.
• Routing updates occur every 90 seconds.
• It is a distance vector routing protocol.
• It is a link state routing protocol.

12 A router has routes to several subnets of a classful network in its routing table. A default route is defined on the router but the ip classless command is disabled. If the router receives packets for a subnet that is not in its routing table but is in the same classful network as the other subnets, what will happen to the packets?
• The packets will be forwarded using the default route.
• The packets will be forwarded using a route to one of the other subnets of the classful network.
• A nonreachable message will be returned to the source.
• The packets will be discarded.
• The router will generate a new route to the subnetted network.

13

The administrator of the network depicted in the graphic would like to decrease the network's convergence time. How can this be accomplished?
• disable split horizon on the routers
• increase the update interval on the routers
• change the RIP holddown timer to 96 seconds
• change the RIP holddown timer to 226 seconds

14

If the passive interface command is enabled on the fa0/0 interface of Router E, which statements are true? (Choose two.)
• Router E will send all routing updates via interface fa0/0.
• Router E will ignore all routing updates learned via interface fa0/0.
• Router E will use routing updates learned via interface fa0/0.
• Router E will not send routing updates via interface fa0/0.

15 Which statements describe load balancing when RIP is configured as the routing protocol? (Choose two.)
• A router is allowed to take advantage of multiple best paths to a given destination.
• RIP uses the round robin approach in load balancing.
• RIP load balancing selects a single path to forward all data to the destination even though equal parallel paths exist.
• RIP load balancing is based on bandwidth first and then the hop count.
• Only one path to a destination can be statically assigned or dynamically calculated.

16

The graphic shows a network that is configured to use RIP routing protocol. Router2 detects that the link to Router1 has gone down. It then advertises the network for this link with a hop count metric of 16. Which routing loop prevention mechanism is in effect?
• split horizon
• error condition
• hold-down timer
• route poisoning
• count to infinity

17

Which of the following would be the correct command sequence to enable RIP on Router B for all connected networks?
• RouterB# router rip
RouterB(router)# network 210.36.7.0
RouterB(router)# network 220.17.29.0
RouterB(router)# network 211.168.74.0

• RouterB(config)# router rip
RouterB(config-router)# network 198.16.4.0
RouterB(config-router)# network 211.168.74.0
RouterB(config-router)# network 199.84.32.0

• RouterB(config)# configure router rip
RouterB(config-router)# network 210.36.7.0
RouterB(config-router)# network 199.84.32.0
RouterB(config-router)# network 211.168.74.0

• RouterB(config)# router rip
RouterB(config-router)# network 198.16.4.0
RouterB(config-router)# network 210.36.7.0
RouterB(config-router)# network 211.168.74.0

• RouterB(config)# router rip
RouterB(config-router)# network 198.16.4.0
RouterB(config-router)# network 210.36.7.0
RouterB(config-router)# network 220.17.29.0

18 When a routing table update is received by a router in a distance vector network, which of the following occurs?
• The hop count metrics for the enclosed routes are incremented.
• The update is forwarded to the gateway router for verification.
• Path entries are checked for routing loops.
• The hop count metrics for the enclosed routes are decremented.
• Static routes are updated with the new information.

19 . The following line was displayed in the output of the show ip route command:
192.168.3.0/24 [120/2] via 192.168.2.2, 00:00:30, Serial0/0
What is the administrative distance of the enabled routing protocol?
• 2
• 30
• 100
• 120

20 When does RIP send routing table updates? (Choose two.)
• periodically, every 30 seconds
• periodically, every 60 seconds
• periodically, every 90 seconds
• if optionally configured, when topology changes occur (triggered-update)

21 Which of the following can exist in a distance vector network that has not converged? (Choose three.)
• routing loops
• inconsistent traffic forwarding
• no traffic forwarding until system converges
• inconsistent routing table entries
• routing table updates sent to wrong destinations

22 What happens to a static route entry in a routing table when the outgoing interface is not available?
• The route is removed from the table.
• The router polls neighbors for a replacement route.
• The route remains in the table because it was defined as static.
• The router redirects the static route to compensate for the loss of the next hop device.