200-150 · Question #101
Which two networking devices forward data based on destination MAC address? (Choose two.)
The correct answer is B. Bridge C. Switch. Bridges and switches are Layer 2 devices that build MAC address tables and use them to make forwarding decisions. Other devices like hubs and repeaters operate at Layer 1 and have no MAC awareness.
Question
Which two networking devices forward data based on destination MAC address? (Choose two.)
Options
- ARepeater
- BBridge
- CSwitch
- DRouter
- EHub
How the community answered
(34 responses)- A3% (1)
- B94% (32)
- D3% (1)
Why each option
Bridges and switches are Layer 2 devices that build MAC address tables and use them to make forwarding decisions. Other devices like hubs and repeaters operate at Layer 1 and have no MAC awareness.
A repeater operates at OSI Layer 1 and only regenerates electrical signals - it has no ability to read or act on MAC addresses.
A bridge operates at OSI Layer 2 and maintains a MAC address table to forward frames out the correct port or filter them if the destination is on the same segment, making MAC-based forwarding its core function.
A switch is essentially a multi-port bridge that also operates at Layer 2, learning MAC addresses dynamically and forwarding unicast frames only to the port associated with the destination MAC address.
A router operates at OSI Layer 3 and makes forwarding decisions based on destination IP addresses, not MAC addresses.
A hub operates at OSI Layer 1 and simply broadcasts all incoming frames out every port without inspecting any address information.
Concept tested: Layer 2 MAC-based forwarding devices
Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet/17465-1.html
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