200-301 · Question #1436
What is a characteristic of frame switching?
The correct answer is C. stores and forwards frames in a buffer and uses error checking. A characteristic of frame switching, particularly store-and-forward switching, is that it stores the entire frame in a buffer, performs an error check, and then forwards it.
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Options
- Apopulates the ARP table with the egress port
- Bdrops received MAC addresses not listed in the address table
- Cstores and forwards frames in a buffer and uses error checking
- Drewrites the source and destination MAC address
How the community answered
(62 responses)- A3% (2)
- B2% (1)
- C94% (58)
- D2% (1)
Why each option
A characteristic of frame switching, particularly store-and-forward switching, is that it stores the entire frame in a buffer, performs an error check, and then forwards it.
Frame switching populates the MAC address table (CAM table) with source MAC addresses and their corresponding ingress ports, not the ARP table.
Switches typically flood frames with unknown destination MAC addresses out all ports except the ingress port; they do not drop them.
Store-and-forward switching, a common method in modern switches, involves receiving the entire Ethernet frame into a buffer before forwarding. During this buffering process, the switch performs an integrity check, such as the Frame Check Sequence (FCS), to detect errors and discards corrupted frames, ensuring only valid data is propagated.
Frame switching operates at Layer 2 and does not rewrite the source and destination MAC addresses of the original frame; that is a function typically associated with routing (Layer 3) or Network Address Translation (NAT).
Concept tested: Frame switching characteristics (store-and-forward)
Source: https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/12027-31.html
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