Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 44

Which statement about Cisco Express Forwarding is true?

Answer options

• A. The CPU of a router becomes directly involved with packet-switching decisions.
• B. It uses a fast cache that is maintained in a router data plane.
• C. It maintains two tables in the data plane: the FIB and adjacency table.
• D. It makes forwarding decisions by a process that is scheduled through the IOS scheduler.

Correct answer: C

Explanation

The correct answer is C because Cisco Express Forwarding indeed maintains both the Forwarding Information Base (FIB) and adjacency table in the data plane to facilitate efficient packet forwarding. Options A, B, and D are incorrect as they misrepresent the function of the CPU in packet switching, the nature of the cache used, and the process of making forwarding decisions, respectively.