ICND1 – Troubleshooting 2

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Question 1

[am4show have=’p2;’]Two routers named Atlanta and Brevard are connected by their serial interfaces as shown in the exhibit, but there is no data connectivity between them. The Atlanta router is known to have a correct configuration. Given the partial configurations shown in the exhibit, what is the problem on the Brevard router that is causing the lack of connectivity?

A. A loopback is not set
B. The IP address is incorrect.
C. The subnet mask is incorrect.
D. The serial line encapsulations are incompatible.
E. The maximum transmission unit (MTU) size is too large.
F. The bandwidth setting is incompatible with the connected interface.

Answer: B[/am4show]

Question 2

[am4show have=’p2;’]Refer to the exhibit. A network technician is unable to ping from R1 to R2. Using the output of the show interfaces serial0/1 command, what should the administrator do to correct the problem?

A. Replace the serial cable between R1 and R2.
B. Reseat the serial connectors on the R1 and R2 routers.
C. Configure the serial0/1 interface on R2 with the no shutdown command.
D. Configure the serial0/1 interface on R1 with the clock rate 56000 command.
E. Configure the serial0/1 interface on R1 with the ip address 192.1.1.7 255.255.255.252 command.

Answer: C[/am4show]

Question 3

[am4show have=’p2;’]Examine the network diagram and router output shown in the exhibit. Users on the BHM LAN are unable to access the server attached to the BHE router. What two things should be done to fix this problem? (Choose two)

A. Enter the configuration mode for interface fastethernet0/0.
B. Enter the configuration mode for interface serial0/0.
C. Enter the configuration mode for interface serial0/1.
D. Issue the run command.
E. Issue the enable command.
F. Issue the no shutdown command.

Answer: B F[/am4show]

Question 4

[am4show have=’p2;’]Refer to the exhibit. A network technician is unable to ping from R1 to R2. What will help correct the problem?

A. Ensure that the serial cable is correctly plugged in to the interfaces.
B. Apply the clock rate 56000 configuration command to the serial0/1 interface of R1.
C. Configure the serial0/1 interfaces on R1 and R2 with the no shutdown command.
D. Change the address of the serial0/1 interface of R1 to 192.1.1.4.
E. Change the subnet masks of both interfaces to 255.255.255.240.

Answer: A[/am4show]

Question 5

[am4show have=’p2;’]What happens when the cable is too long?

A. Baby Giant
B. Late collision
C. Duplex mismatch
D. No connection

Answer: B[/am4show]

Explanation

A late collision is defined as any collision that occurs after the first 512 bits of the frame have been transmitted. The usual possible causes are full-duplex/half-duplex mismatch, exceeded Ethernet cable length limits, or defective hardware such as incorrect cabling, non-compliant number of hubs in the network, or a bad NIC.

Late collisions should never occur in a properly designed Ethernet network. They usually occur when Ethernet cables are too long or when there are too many repeaters in the network.

Reference: https://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html