Switching Internals & Cloud Models Practice Questions

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What is the primary difference between Cisco Express Forwarding (CEF) and Fast Switching?

Fast switching builds a cache after the first packet is process-switched; CEF pre-builds the FIB and Adjacency tables before packets arrive.

Fast switching processes the first packet of a flow via CPU (process switching) to build a cache entry. CEF pre-populates the Forwarding Information Base (FIB) and Adjacency Table directly from the routing table and ARP table prior to traffic arrival.

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