If host A is able to successfully ping router R1 but not router R2, which of the following is guaranteed?
A) Port security is not filtering frames sent between host A and R1.
B) Port security is filtering frames sent by R2.
C) R2 itself is down.
D) STP has not placed the right ports in a forwarding state.
A
Explanation: A) The only known item in the list is that messages are sending/receiving from host A and R1. None of the other items can be concluded from the information given.
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