Which of the following can be concluded if a ping works between routers on either end of a serial link?
A) Both router's serial interfaces are in an up/up state.
B) The Layer 1 and 2 features of the link work.
C) Inbound ACLs on both routers filter packets successfully.
D) The routers understand that the neighboring router's IP address is in a different subnet.
A, B
Explanation: A) For the ping to succeed, it means Layer 1 and 2 features work, and both serial interfaces are in an up/up state. The routers should believe that they are in the same subnet, and there is no way to conclude that the ACLs are fully operational.
B) For the ping to succeed, it means Layer 1 and 2 features work, and both serial interfaces are in an up/up state. The routers should believe that they are in the same subnet, and there is no way to conclude that the ACLs are fully operational.
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