29. An 802.1Q trunk is not coming up between two switches. The ports on both switches are
清空用户设备的 ARP表
D. Clear the ARP cache in the application servers.
configured as "switchport mode desirable." Assuming that there is no physical issue, choose two possible causes. (Choose two.)
在两台交换机之间一个802.1Q的trunk没有启动。这两个接口配置为“desirable”模式，价 格机器硬件没有任何问题，哪两个原因可能?
A. Incorrect VTP domain
B. Incorrect VTP password
C. Incorrect VTP mode
D. Incorrect VTP configuration revision
Answer: AB
30. Refer to the exhibit. Look at the command output. What would be the most probable reason for this port-ID mismatch?
如图所示，看到这个命令的输出，这个端口号不匹配的最能的原因是什么
A. spanning-tree misconfiguration
B. speed mismatch configuration
C. cabling problem
Answer: C
