350-401 Exam Dumps | What is the difference between CEF and process switching?

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Cisco.350-401.v2021-07-03.q129
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Question 62/129

What is the difference between CEF and process switching?

A. CEF processes packets that are too complex for process switching to manage.

B. CEF is more CPU-intensive than process switching.

C. CEF uses the FIB and the adjacency table to make forwarding decisions, whereas process switching punts each packet.

D. Process switching is faster than CEF.

Correct Answer: C

Explanation
Punt is often used to describe the action of moving a packet from the fast path (CEF) to the route processor for handling.
Cisco Express Forwarding (CEF) provides the ability to switch packets through a device in a very quick and efficient way while also keeping the load on the router's processor low. CEF is made up of two different main components: the Forwarding Information Base Adjacency Table.
Process switching is the slowest switching methods (compared to fast switching and Cisco Express Forwarding) because it must find a destination in the routing table. Process switching must also construct a new Layer 2 frame header for every packet. With process switching, when a packet comes in, the scheduler calls a process that examines the routing table, determines which interface the packet should be switched to and then switches the packet. The problem is, this happens for the every packet.
Reference: http://www.cisco.com/web/about/security/intelligence/acl-logging.html

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