思科第十章Routing and Switching Essentials 英文 答案

1.

A ping fails when performed from router R1 to directly

connected router R2. The network administrator then

proceeds to issue the show cdp neighbors command. Why

would the network administrator issue this command if the

ping failed between the two routers?

The network administrator suspects a virus because the ping command did not

work.

?

The network administrator wants to verify Layer 2 connectivity.

?

The network administrator wants to verify the IP address configured on router R2.

?

The network administrator wants to determine if connectivity can be established

from a non-directly connected network.

?

2.

Which statement is true about CDP on a Cisco device?

The show cdp neighbor detail command will reveal the IP address of a neighbor

only if there is Layer 3 connectivity.

?

To disable CDP globally, the no cdp enable command in interface configuration

mode must be used.

?

CDP can be disabled globally or on a specific interface.

?

Because it runs at the data link layer, the CDP protocol can only be implemented

in switches.

?

3.

Why would a network administrator issue the show cdp

neigbors command on a router?

to display device ID and other information about directly connected Cisco

devices

?

to display router ID and other information about OSPF neighbors

?

to display line status and other information about directly connected Cisco

devices

?

to display routing table and other information about directly connected Cisco

devices

?

4.

Refer to the exhibit. Routers R1 and R2 are connected via a

serial link. One router is configured as the NTP master, and

the other is an NTP client. Which two pieces of information

can be obtained from the partial output of the show ntp

associations detail command on R2? (Choose two.)

?

?

?

?

?

Both routers are configured to use NTPv2.

Router R1 is the master, and R2 is the client.

Router R2 is the master, and R1 is the client.

The IP address of R1 is 192.168.1.2.

The IP address of R2 is 192.168.1.2.

5.

Which two statements are true about NTP servers in an

enterprise network? (Choose two.)

?

?

?

?

There can only be one NTP server on an enterprise network.

All NTP servers synchronize directly to a stratum 1 time source.

NTP servers at stratum 1 are directly connected to an authoritative time source.

NTP servers ensure an accurate time stamp on logging and debugging

information.

?

NTP servers control the mean time between failures (MTBF) for key network

devices.

6.

The command ntp server 10.1.1.1 is issued on a router. What

impact does this command have?

?

?

?

?

determines which server to send system log files to

identifies the server on which to store backup configurations

ensures that all logging will have a time stamp associated with it

synchronizes the system clock with the time source with IP address 10.1.1.1

7.

Refer to the exhibit. Which two conclusions can be drawn

from the syslog message that was generated by the router?

(Choose two.)

?

?

?

?

?

This message resulted from an unusual error requiring reconfiguration of the

interface.

This message indicates that the interface should be replaced.

This message is a level 5 notification message.

This message indicates that service timestamps have been configured.

This message indicates that the interface changed state five times.

8.

Which protocol or service allows network administrators to

receive system messages that are provided by network

devices?

?

?

?

?

syslog

NTP

SNMP

NetFlow

9.

Which syslog message type is accessible only to an

administrator and only via the Cisco CLI?

?

?

?

?

errors

debugging

emergency

alerts

10.

Refer to the exhibit. From what location have the

syslog messages been retrieved?

?

?

?

?

syslog server

syslog client

router RAM

router NVRAM

11.

Refer to the exhibit. What does the number

17:46:26.143 represent?

?

?

?

?

the time passed since the syslog server has been started

the time when the syslog message was issued

the time passed since the interfaces have been up

the time on the router when the show logging command was issued

12.

What is used as the default event logging destination

for Cisco routers and switches?