最新的CCNA認證 640-821考試題庫

問題1

DRAG DROP
drag drop

正確答案:

問題2

HOTSPOT
lab

正確答案:

問題3

What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?

A. 31

B. 15

C. 16

D. 32

E. 30

F. 14

正確答案: E

問題4

Which IOS user EXEC command will allow a network technician to determine which router in the path to an unreachable network host should be examined more closely for the cause of the network failure?

A. Router> show interface

B. Router> ping

C. Router> trace

D. Router> telnet

E. Router> show cdp neighbors

F. Router> show ip route

正確答案: C

問題5

DRAG DROP
drag drop

正確答案:

問題6

If a host on a network has the address 172.16.45.14/30, what is the address of the subnetwork to which this host belongs?

A. 172.16.45.4

B. 172.16.45.16

C. 172.16.45.12

D. 172.16.45.8

E. 172.16.45.0

正確答案: C

問題7

lab

正確答案:

Shore(config)# interface eth0
Shore(config-if)# ip address 192.168.195.113 255.255.255.240
Shore(config-if)# no shutdown
Shore(config-if)# exit
Shore(config)# interface ser0
Shore(config-if)# ip address 192.168.195.33 255.255.255.240
Shore(config-if)# no shutdown
Shore(config-if)# exit
Shore(config)# router rip
Shore(config-router)# network 192.168.195.0
Shore(config-router)# end
Shore# copy run start

問題8

An administrator cannot connect from R1 to R2. To troubleshoot this problem, the administrator has entered the command shown in the exhibit. Based on the output shown, what could be the problem?

A. The serial interface is configured for half duplex.

B. The serial interface has the wrong type of cable attached.

C. The serial interface is configured for the wrong frame size.

D. The serial interface has a full buffer.

E. The serial interface does not have a cable attached.

正確答案: B

問題9

Refer to the exhibit. If host A sends an IP packet to host B, what will the OSI Layer 3 source address be in the packet when it reaches host B?

A. C3:C3:C3:C3:C3:C3

B. 10.168.10.99

C. A1:A1:A1:A1:A1:A1

D. 10.168.11.88

E. B2:B2:B2:B2:B2:B2

F. 10.168.11.65

正確答案: B

問題10

Refer to the exhibit. Why was this message received?

A. The login command has not been set on CON 0.

B. No console password has been set.

C. No enable secret password has been set.

D. No VTY password has been set.

E. The login command has not been set on the VTY ports.

F. No enable password has been set.

正確答案: D

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