正确答案: D
当主接口逻辑通道时，如果呼叫3次未成功，则认为主逻辑通道处于down状态
题目：命令Backup state-down3表示______。
解析：解析：命令Backup state-down n表示当主接口逻辑通道时，如果呼叫n次未成功，则认为主逻辑通道处于down状态，本题参考数为3，故选D。
学习资料的答案和解析：
Router(config)ip dhcp pool test Router(config)ip dhcp excluded-address 202.112.7.2-10 Router(dhcp-config)network 202.112.7.0 255.255.255.0
Router(config)ip dhcp excluded-address 202.112.7.2-10 Router(config)ip dhcp pool test Router(dhcp-config)network 202.112.7.0/24
Router(config)ip dhcp excluded-address 202.112.7.2-10 Router(config)ip dhcp pool test Router(dhcp-config)network 202.112.7.0 0.0.0.255
Router(config)ip dhcp excluded-address 202.112.7.2-10 Router(config)ip dhcp pool test Router(dhcp-config)network 202.112.7.0 255.255.255.0
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