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计算机网络基础(双语)
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QUESTION NO: 1

Which of the following troubleshooting tools use the protocol ICMP? (Choose two)

 

A.  Ping  

B.  Telnet 

C.  Configure

D.  Trace route  

E.  Show commands

F.  Standard access list

 

 

Answer: A, D

Explanation: The two protocol tools that use ICMP messaged to perform their function are ping and trace

route.

 

Incorrect Answers:

B: Telnet uses TCP.

C: Configure is not a protocol tool.

E: They are not part of ICMP, nor do they use ICMP.

 

. (Cisco Press: 2000) pages 217-218.

Steve McQuerry.  Interconnecting Cisco Network Devices

 

 

 

QUESTION NO: 2

Which one of the following is a layer two broadcast?  

 

A.  The IP subnet used is 255.255.255.0

B.  The IP address used is 255.255.255.255

C.  The MAC address used is 00-00-00-00-00-00

D.  The MAC address used is FF-FF-FF-FF-FF-FF.  

 

 

Answer: D

Explanation: The MAC address for a broadcast is FF-FF-FF-FF-FF-FF.

 

Incorrect Answers:

A and B: These are IP addresses and 802.3 uses MAC addresses.

C: This is the address used for a multicast.

 

Steve McQuerry.  Interconnecting Cisco Network Devices

. (Cisco Press: 2000) pages 149-152.

 

      

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Explanation: 

IP route command defines static route on a particular router, Traffic from 192.168.12.0 network is forwarded to

172.16.12.1 ( IP address of next hop interface).

Incorrect answers

B: It will not invoke any routing Protocol. It defines static route.

D: Only traffic from 192.168.12.0 network is forwarded to 172.16.12.1.

E: It will not propagate route automatically by using ip route command. Route will be propagated only if you

defined routing protocol configured networks.

 

 

 

 

 

QUESTION NO: 2

What does a configuration Register Setting of 0x2105 indicate to the Router?

 

 

      

       

   

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A.  The Boot IOS Code is Located in the NVRAM.

B.  Check NVRAM for boot system Commands.

C.  Bypass NVRAM Configurations.

D.  Boot the IOS Code Located in ROM.

E.  Perform a Password Recovery.

F.  Bypass The Code In ROM.

 

 

Answer: B

Explanation:  

It is stated in the book ICND by Steve McQuerry page 127 that if the configuration register boot field value is

from 0x2 to 0xF, the bootstrap code parses any configuration in NVRAM for boot system commands.

Incorrect Answers:

A: Statement is wrong because IOS code is located in flash not NVRAM (startup-configuration)

C: Register setting of 0x2105 where 5 is the boot field. Boot field value of 0x2 to 0xF will look for startup-

configuration in the NVRAM and won't be bypass.

D: Statement is wrong because IOS code is located in flash not ROM (RxBoot).

E: This register is not for password recovery.

F: This statement is wrong.

 

 

  

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Explanation:  Because the question stated that the technician initiated a telnet session to Testking1 not

TestKing2 so the layer 2 destination address will have the TestKing1 MAC address.

 

Incorrect Answers:

A, C: Serial interfaces don't have layer 2 addresses (MAC addresses)?

D: Telnet initiated from Testking 1. It will not show Mac address of EO on Testking2

 

 

 

QUESTION NO: 4

Exhibit:

*** Out Put Omitted***

 

MTU 1500 bytes, Bw 10000 kbit, Dly 100 Usec.

reliability 128/255, txload 1/255. rx 253/255

Encapsulation Arpa, Loopback not set

Keepalive set (10 sec)

Arp type: Arpa Timeout 04:00:00

Last Input 21:24:36, output 00:00:08, Output hang never

 

*Out Put Omitted***

 

Users have been complaining that network applications are running very slowly and responding to input

commands intermittently. While troubleshooting the problem, a TestKing technician issues the slow

interface E0 command on the router attached to the network. Based on the partial output shown in the

exhibit.. Which of the following items indicates that interface E0 is overloaded and causing the network

to perform slowly?

 

 

A.  MTU 1500 bytes

B.  BW 10000 kbit

C.  DLY 1000 usec

D.  Reliability 128/255

E.  txload 1/255

F.  rxload 253/255

 

 

Answer: D

Explanation: Interface E0 is only 50% reliable (128/255) where 255/255 being 100% reliable.

 

Incorrect Answers:

A, B, C: Because those are default settings and those output are the output readings in normal operation.

 

 

 

 

      

         

     

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QUESTION NO: 5

Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two) 

 

A.  Transport layer divides a data stream into segments & adds reliability & flow control information 

B.  Data link layer adds physical source & destination address & an FCS to the segment 

C.  Packets are created when the network layer encapsulate a frame with source & destination host address

& protocol related control information 

D.  Packets are created when the network layers adds layers 3 address & control information to a segment 

E.  The presentation layer translated bits into bits into voltages for transmission across the physical link 

 

 

Answer: A, D

Explanation:

A: It is the function of Transport layer. TCP and UDP operates in this layer

D: It is the function of the network layer. 

Incorrect answers:

B: It will use frames instead of segments.

C: The network layer can not encapsulate frame. It adds Layer 3 address to segment received from transport

layer.

E: It is not the function of Presentation layer. It is function of Physical layer.

 

 

 

      

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