2. 计算机
  3. Refer to the exhibit．The following commands are executed on interface fa0/1 of 2950Switch． 2950Switch(config-if)# switchport por

Refer to the exhibit．The following commands are executed on interface fa0/1 of 2950Switch． 2950Switch(config-if)# switchport por

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问题 Refer to the exhibit．The following commands are executed on interface fa0/1 of 2950Switch．
2950Switch(config-if)# switchport port-security
2950Switch(config-if)# switchport port-security mac-address sticky
2950Switch(config-if)# switchport port-security maximum 1
The Ethernet frame that is shown arrives on interface fa0/1． What two functions will occur when this frame is received by 2950Switch?
选项 A、        The MAC address table will now have an additional entry of fa0/1 FFFF．FFFF．FFFF．
B、        Only host A will be allowed to transmit frames on fa0/1．
C、        This frame will be discarded when it is received by 2950Switch．
D、        All frames arriving on 2950Switch with a destination of 0000．00aa．aaaa will be forwarded out fa0/1．
E、        Hosts B and C may forward frames out fa0/1 but frames arriving from other switches will not be forwarded out fa0/1．
答案B,D
解析 考点：考查交换机端口安全。maximum 1说明只允许一个mac通过。
A：添加ffff．ffff．ffff到mac地址表，错误。这是个arp报文，把数据包源mac添加到mac表。
B：仅允许主机A通过f0/1，正确。
C:当2950switch收到帧后丢弃，错误。应该是除f0/1外所有端口洪泛。
D：当2950switch收到目的为0000．00aa．aaaa的数据帧会从f0/1转发，正确。
E：主机B和C的数据帧会从f0/1转发，但从其他交换接收到的不会，错误。
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