ITPEC FE Morning October 2021 Question 30
ITPEC FE Morning October 2021 — Question 30 of 80
OSI Network Layer Device — identify which device operates at Layer 3.
Layer-to-device mapping:
- Layer 1 (Physical): Repeater, Hub — signal amplification only
- Layer 2 (Data Link): Bridge, Switch, Access Point — forward by MAC address
- Layer 3 (Network): Router — forward by IP address
Answer: `d) Router`
Why not others:
- (a) Access point — operates at Layer 1–2, connects wireless clients
- (b) Bridge — operates at Layer 2, filters frames by MAC address
- (c) Repeater — operates at Layer 1, regenerates electrical signals
Key rule: Layer 3 = IP routing → Router. Mnemonic: "Repeater → Bridge → Router" maps to Layers 1 → 2 → 3.
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