Troubleshooting

Question 1

In the following partial output of the show ip route command, what does the letter D stand for?

D 192.1.2.0/24 via 5.1.1.71 [w:0 m:0]

C 192.8.1.1/32 directly connected to loopback 0

Answer 1

This is an EIGRP route

Question 2

A switch is powered up, and the system LED is amber. What is this indicative of?

Answer 2

The switch is malfunctioning

Question 3

A switch is powered up, and the system LED is amber. What is this indicative of?

Answer 3

The switch is malfunctioning

Question 4

How many pairs of wire are used in transmission and receipt of a signal in a crossover cable?

Answer 4

2 of the 8 Wires are used

Question 5

What can be determined from this output?

Ethernet 0/0 is up, line protocol is down

Answer 5

You can determine that the link is not functional due to a Data Link Layer issue.

Question 6

What can be determined from this output?

Ethernet 0/0 is up, line protocol is down

Answer 6

You can determine that the link is not functional due to a Data Link Layer issue.

Question 7

What would the show interfaces command output be, if there was an indication that the link may not be functional due to a Data Link layer issue, while the Physical layer is operational?

Answer 7

Ethernet 0/0 is up, line protocol is down

Question 8

What are the three minimum commands needed to configure Secure Shell (SSH) for remote management of a Cisco device?

Answer 8

1. ip domain-name [domain-name]
2. crypto key generate rsa
3. transport input ssh

Question 9

What command would generate the following as part of its output (some output is omitted)?

Protocol [ip]:
Target IP address: 10.10.10.1
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 12.1.10.2 
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.

Answer 9

extended ping

Question 10

What are the valid Frame Relay encapsulations that are supported on Cisco routers?

Answer 10

Cisco & IETF

Question 11

Which Frame Relay encapsulation will work on a network that also has non-Cisco devices?

Answer 11

IETF

Question 12

What is the default Frame Relay encapsulation for a Cisco device?

Answer 12

Cisco

Question 13

You are planning the configuration of an IPsec-protected connection between two routers. You are concerned only with the integrity of the data that passes between the routers. You are less concerned with the confidentiality of the data, and you would like to minimize the effect of IPsec on the data throughput.

Which protocol option should you choose?

Answer 13

Authentication Header (AH) in tunnel mode

Question 14

You are planning the configuration of an IPsec-protected connection between two routers. You are concerned only with the integrity of the data that passes between the routers. You are less concerned with the confidentiality of the data, and you would like to minimize the effect of IPsec on the data throughput.

Which protocol option should you choose?

Answer 14

Authentication Header (AH) in tunnel mode

Question 15

In the output of “show ip interface brief”, How can you tell if an interface is shutdown?

Answer 15

The output will show that the interface is “Administratively Down”

Question 16

What would be the output of an interface if you found one of the following issues?
• There are no problems with the physical connectivity.
• There is a configuration problem in the local or remote
router.
• The remote router might not be sending the keep-
alives.
• There may be a problem with the leased lines such as
line noise and a malfunctioning switch.
• There is an incorrect configuration of the CSU/DSU,
which can cause timing issues on the cable.
• The local or remote CSU/DSU might have failed.

Answer 16

You will see “Serial 0 is up, line protocol is down”

Question 17

Which show command can you use to display the status of each configured connection, traffic statistics, and the number of Backward Explicit Congestion Notification (BECN) and Forward Explicit Congestion Notification (FECN) packets received by the router?

Answer 17

show frame-relay pvc