Chapter 7 Review Questions

Question 1

Which is a standards-based protocol that provides dynamic network discovery?

Answer 1

LLDP (Link Layer Discovery Protocol)

Question 2

Which command can be used to determine a router’s CPU utilization?

Answer 2

show processes cpu If the CPU utilization is high, it is not a good time to execute a debug command

Question 3

You are troubleshooting a connectivity problem in your corporate network and want to isolate the problem. You suspect that a router on the route to an unreachable network is at fault. What IOS user exec command should you issue?

Answer 3

Router>traceroute (or ‘trace’ for short) It is used to find a path the packet takes. It will show where the packet stops due to an error on a router

Question 4

You copy a configuration from a network host to a router’s RAM. The configuration looks correct, yet it is not working at all. What could the problem be?

Answer 4

The copy did not override the shutdown command in running-config. You probably didn’t mess up the copy job. However, when you perform a copy from a network host to a router, the interfaces automatically shuts down and …

…need to be manually enabled with the no shutdown command

Question 5

In the following command, what does the IP address 10.10.10.254 refer to? Router#config t Router(config)#interface fa0/0 Router(config-if)#ip helper-address 10.10.10.254

Answer 5

IP address of the DHCP server Specifying the address of the DHCP server allows the router to relay broadcast traffic destined for a DHCP server to that server

Question 6

The corporate office sends you a new router to connect, but upon connecting the console cable, you see that there is already a configuration on the router. What should be done before a new configuration is entered in the router?

Answer 6

NVRAM should be erased and the router restarted. You use the ‘erase startup-config’ command and the ‘reload’ command

Question 7

What command can you use to determine the IP address of a directly connected neighbor?

Answer 7

‘show cdp neighbors detail’ It can run on both routers and switches. It displays detailed information about devices connected to the device you run the command on.

Question 8

Answer 8

Fas 0/2

The Port ID column describes the interfaces on the remote device end of the connection.

Question 9

Which of the following commands enables syslog on a Cisco device with debugging as the level?

Answer 9

logging 172.16.10.1

Syslog level 7(Debugging or loacal7) is the default if you were to use that command from global config

Question 10

You save the configuration on a router with the ‘copy running-config startup-config’ command and reboot the router. The router, however, comes up with a blank configuration. What can the problem be?

Answer 10

The configuration register setting is incorrect

You can assume the same thing if you do all those steps and the setup mode comes up

Question 11

If you want to have more than one Telnet session open at the same time, what keystroke combination would you use?

Answer 11

Ctrl+Shift+6, then X

Question 12

You are unsuccessful in telnetting into a remote device from your switch, but you could telnet to the router earlier. However, you can still ping the remote device. What could the problem be?

Answer 12

An access control list is filtering Telnet

The VTY password is not set on the remote device

Question 13

What information is displayed by the ‘show hosts’ command?

Answer 13

Temporary DNS entries

Permanent name-to-address mappings created using the ip host command

Question 14

Which three commands can be used to check LAN connectivity problems on an enterprise switch?

Answer 14

show interfaces

show ip route

dns lookups

Question 15

What is the default syslog facility level?

Answer 15

local7

CiscoIOS devices use facility local7 by default. Most Cisco devices provide options to change the facilityt level from their default value

Question 16

You telnet into a remote device and type ‘debug ip icmp’, but no output from the debug command is seen. What could the problem be?

Answer 16

You must use the ‘terminal monitor’ command

You must use that command to see console messages through your Telnet session

Question 17

A syslog server provides the ______ necessary to store _____ without using router _____.

Answer 17

storage space

log files

disk space

Question 18

There are significantly more syslog messages available within Cisco IOS as compared to ____ trap messages

What are _____ trap messages?

Answer 18

SNMP Traps are alert messages sent from a remote SNMP-enabled device to a central collector, the “SNMP manager”. A Trap might tell you that a device is overheating, for example.

Question 19

A syslog server helps in ______ of logs and alerts

Answer 19

Aggregation

Question 20

You need to gather the IP address of a remote switch that is located in Hawaii. What can you do to find the address?

Answer 20

Issue the ‘show cdp neighbors detail’ command on the router connected to the switch

Question 21

You need to configure all your routers and switches so they synchronize their clocks from one time source. What command will you type for each device?

Answer 21

ntp server ‘ip-address’

and

ntp master ‘stratum level’

Stratum level is quality of clock source, lower the better (2, 5, etc.)

At least one NTP server must be a trusted clock source. If using purpose-built NTP servers (that is, when not using routers and switches as NTP servers), those servers will make good clock sources. But in a lab with only Cisco router/switches, one router/switch has to be set up as a clock source using ntp master

Question 22

A network administrator enters the following command on a router: ‘logging trap 3’. What are three message types that will be sent to the syslog server?

Answer 22

Emergency, Critical, and Error