200-301 · Question #1497
What is a characteristic of frame switching?
The correct answer is B. performs a lookup to learn the destination interface. Frame switching involves a Layer 2 switch using its MAC address table to efficiently forward frames to the correct destination interface.
Question
Options
- Arewrites the source and destination MAC address
- Bperforms a lookup to learn the destination interface
- Csends a retransmission request when a new frame is received
- Dinspects and drops frames from unknown destinations
How the community answered
(55 responses)- A2% (1)
- B89% (49)
- C5% (3)
- D4% (2)
Why each option
Frame switching involves a Layer 2 switch using its MAC address table to efficiently forward frames to the correct destination interface.
Frame switching at Layer 2 does not rewrite source and destination MAC addresses; that function is typically associated with Layer 3 routing or specialized network address translation.
A Layer 2 switch performs a lookup in its MAC address table based on the destination MAC address of an incoming frame to identify the specific egress interface where the destination device is located, allowing for precise frame forwarding.
Switches do not send retransmission requests; retransmissions are handled by higher-layer protocols (e.g., TCP) if data is lost.
A switch typically forwards frames with unknown destination MAC addresses out all ports within the same VLAN (flooding), rather than dropping them, to try and find the destination.
Concept tested: Layer 2 switch frame forwarding mechanism
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_55_se/configuration/guide/scg/swbasic.html
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