220-801 · Question #810
Which of the following devices is used to move frames between a source and destination based on a MAC address?
The correct answer is D. Switch. A switch operates at Layer 2 of the OSI model and uses a MAC address table to forward frames only to the specific port where the destination device resides.
Question
Which of the following devices is used to move frames between a source and destination based on a MAC address?
Options
- ARepeater
- BHub
- CRouter
- DSwitch
How the community answered
(44 responses)- B2% (1)
- C2% (1)
- D95% (42)
Why each option
A switch operates at Layer 2 of the OSI model and uses a MAC address table to forward frames only to the specific port where the destination device resides.
A repeater operates at Layer 1 and simply amplifies or regenerates a signal without any awareness of addressing.
A hub also operates at Layer 1 and broadcasts all incoming frames out every port, with no MAC address intelligence.
A router operates at Layer 3 and uses IP addresses (not MAC addresses) to make forwarding decisions between different networks.
A switch builds and maintains a MAC address table (also called a CAM table) by learning source MAC addresses on each port. When a frame arrives, the switch looks up the destination MAC address in this table and forwards the frame only to the correct port, enabling efficient unicast communication.
Concept tested: Switch Layer 2 MAC address forwarding
Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet/10560-switching-ethernethow.html
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