uRPF的第一步是什么？

coolhu101

QUESTION 190
When unicast reverse path forwarding is configured on an interface, which action does the interface
take first when it receives a packet?
A. it verifies that the source has a valid VEF adjacency.
B. It checks the egress access lists.
C. it verifies a reverse path via the FIB to the source.
D. It checks the ingress access lists.


Correct Answer: D
ACL理论上应该是最后一步啊，看不懂，有大神解惑么

kfc369

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