参加下图，出现默认网关Ping 不通的情况，出问题的协议层是（  ）。 C: \>ping  10.10.10.1 Pinging  10.10.10.1 with  32  bytes  of  data: Request timed out. Request  timed out. Request  timed out. Request  timed out. Ping statistics for 10.10.10.1: Packets:   Sent=4 ，Received=0，Lost=4  (100%  loss)

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参加下图，出现默认网关Ping 不通的情况，出问题的协议层是（）。
C: \>ping 10.10.10.1
Pinging 10.10.10.1 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 10.10.10.1:
Packets: Sent=4 ，Received=0，Lost=4 (100% loss)

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