ITPEC FE Morning October 2020 Question 31
ITPEC FE Morning October 2020 — Question 31 of 80
Bridge — a device operating at the data link layer (Layer 2) of the OSI model that connects multiple LANs by relaying frames based on MAC addresses.
How it works:
- Receives frames on one port
- Reads the destination MAC address
- Forwards the frame only to the port where the destination device is located
- This reduces unnecessary traffic between LAN segments
Why not others:
- (b) Gateway — operates at the application layer (Layer 7); translates between different network protocols
- (c) Repeater — operates at the physical layer (Layer 1); simply amplifies/regenerates electrical signals with no protocol awareness
- (d) Router — operates at the network layer (Layer 3); forwards packets based on IP addresses
Key rule: OSI device mapping — Repeater = L1, Bridge/Switch = L2, Router = L3, Gateway = L7.
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