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Module9_S2

   Trong: CCNA
 
Nov 11 2007, 09:27 PM     Bởi: lehuy0305
1.
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
2.


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
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.
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.
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.
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
7.


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 A.
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.
8.
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
9.
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.
10.
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.
11.
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
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 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
14.
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
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, Serial0
16.
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
17.
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
18.
Which command will verify the functionality of all seven layers of the OSI model on a network host?
ping
debug
telnet
traceroute
19.
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
20.
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
21.
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
22.
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.
23.
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
24.


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

 

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