ccna题库 251-300.doc

QUESTION 251 Answer: BCF
串口通过keepalive包保活端口。协议层down通常是时钟,封装,线缆使用不对造成
The show interfaces serial 0/mand resulted in the output shown in the graphic. What are possible causes for this interface status? (Choose three.)
A. The interface is shut down.
B. No keepalive messages are received.
C. The clockrate is not set.
D. No loopback address is set.
E. No cable is attached to the interface.
F. There is a mismatch in the encapsulation type.
QUESTION 252Answer: BD
私有地址的特性
A:可以和互联网通信,错误 B:不能和互联网通信,正确。
C:能被互联网路由,错误 D:用于节省IP地址,正确。通过nat实现。
E:需要经过授权使用,错误
Which of the following describe private IP addresses? (Choose two.)
A. addresses chosen by pany municate with the
B. addresses that cannot be routed through the public
C. addresses that can be routed through the public
D. a scheme to conserve public addresses
E. addresses licensed to enterprises or ISPs by an anization
QUESTION 253 Answer: BD
考查VLSM。网关和主机IP需在同一个子网。路由器子接口IP为这个vlan中主机的网关
Refer to the exhibit. work shown in the diagram is experiencing connectivity problems. Which of the following will correct the problems? (Choose two.)
A. Configure the gateway on Host A as .
B. Configure the gateway on Host B as .
C. Configure the IP address of Host A as .
D. Configure the IP address of Host B as .
E. Configure the masks on both hosts to be .
F. Configure the masks on both hosts to be .
QUESTION 254 Answer: ACD
ess口
work associate is trying to understand the operation of the FLD Corporation by studying work in the exhibit. The associate knows that the server in VLAN 4 provides the necessary resources to support the user hosts in the other VLANs. The associate needs to determine which interfaces are access ports. Which interfaces are access ports? (Choose three.)
A. Switch1 - Fa 0/2
B. Switch1 - Fa 0/9
C. Switch2 - Fa 0/3
D. Switch2 - Fa 0/4
E. Switch2 - Fa 0/8
F. Router - Fa 1/0
QUESTION 255 Answ