Which Frame Relay feature is responsible for transmitting keepalives to ensure that the PVC does not shut down because of inactivity?（）
- A、DLCI
- B、BECN
- C、FECN
- D、LMI
- E、CIR
- F、DE
正确答案:D
答案解析:有
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思科认证考试
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Which Frame Relay feature is responsible for transmitting keepalives to ensure that the PVC does not shut down because of inactivity?（）
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