Posted by: Pdfprep
Post Date: November 23, 2020
When unicast reverse path forwarding is configured on an interface, which action does the interface take first when it receives a packet?
A . It check the ingress access list
B . It check the egress access list
C . It verifies that the source has a valid CEF adjacency
D . It verifies a reverse path via the FIB to the source
Answer: D
Explanation:
When a packet is received at the interface where Unicast RPF and ACLs have been configured, the following actions occur:
Step 1: Input ACLs configured on the inbound interface are checked.
Step 2: Unicast RPF checks to see if the packet has arrived on the best return path to the source, which it does by doing a reverse lookup in the FIB table
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