不定项选择题
16.
The line protocol on a virtual tunnel interface goes up and down based upon which of the following?虚拟隧道接口的线路协议状态与以下哪个因素有关?
A、
Seeing its own Ethernet loopback packet return当自身发送的以太网环回数据包返回时
B、
Successful Layer 2 connectivity成功建立二层连接
C、
The state of the IPsec SA negotiation IPSec SA协商的状态
D、
The network administrator not shutting the interface管理员未关闭接口
E、
None of these answers are correct. 以上答案均不正确
【正确答案】
C
【答案解析】
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