下列哪些内部路由协议支持VLSM（）

A.RIP-1

B.RIP-2

C.EIGRP

D.OSPF

E.IS-IS

在使用链路状态路由的网络中，由网络变更触发的更新可以加速收敛过程。

此题为判断题(对，错)。

RIP用()作为度量值。

A.管理距离

B.带宽

C.跳数

D.时间

During startup, router VE1 displays the following error message:

boot: cannot open "flash:"

What will VE1 do next?

A. It will attempt to locate the configuration file from a TFTP server. If this fails, it will initiate the setup dialog.

B. It will attempt to locate the IOS from a TFTP server. If this fails, it will load a limited IOS from ROM.

C. It will attempt to locate the configuration file from a TFTP server. If this fails, it will load a limited configuration from ROM.

D. Because of damaged flash memory, the router will fail the POST.

E. It will attempt to locate the IOS from a TFTP server. If this fails, it will initiate the setup dialog.

F. None of the above

SMTP工作在OSI哪一层（）

A.会话层

B.表示层

C.传输层

D.应用层

When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?

A．when all switches have the same BID as the root switch

B．when all switches have received the MAC address of each neighboring switch

C．when every enabled switch port has been assigned a unique identifier

D．when every operating switch port is in either the blocking or forwarding state

E．when all switches are in either client, server, or transparent mode

IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP和掩码结合划分子网时，每个子网的容量为（）

A.8

B.4

C.12

D.6

PPP协议不支持的协商选项是()。

A.地址协商

B.身份认证

C.链路压缩

D.多种网络层协议

交换机上VLAN的功能描述中，正确的是（）

A.可以减少广播域的个数

B.可以减少广播对网络性能的影响

C.可以减少冲突域的个数

D.可以减小冲突域的容量

A Ezonexam Ethernet switch receives a unicast frame. with a destination MAC that is listed in the switch table. What will this switch do with the frame?

A. The switch will forward the frame. to a specific port

B. The switch will forward the frame. to all ports except the port on which it was received

C. The switch will return a copy of the frame. out the source port

D. The switch will not forward unicast frames

E. The switch will remove the destination MAC from the switch table

F. None of the above.