A switch receives a frame The destination MAC address is located on the same port where the switch received the frame Which action does the switch perform on the frame?

The correct answer is B. filter. When a switch receives a frame, it looks up the destination MAC address in its MAC address table to determine the outgoing port. If the destination MAC is found on the same port that the frame arrived on, the switch filters (drops) the frame. Forwarding it back out the same…

Cisco Data Center Networking Technologies

Question

Options

Abuffer
Bfilter
Cforward
Dflood

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(34 responses)

A
6% (2)
B
88% (30)
C
3% (1)
D
3% (1)

Explanation

When a switch receives a frame, it looks up the destination MAC address in its MAC address table to determine the outgoing port. If the destination MAC is found on the same port that the frame arrived on, the switch filters (drops) the frame. Forwarding it back out the same port would be pointless since the destination device is already reachable on that segment, and doing so could cause issues. This is called filtering. By contrast: flooding sends a frame out all ports except the ingress port (used for unknown destinations); forwarding sends the frame to a specific different port; buffering temporarily holds frames during congestion.

Topics

#switching#MAC address table#frame filtering#Layer 2

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