ITPEC FE Morning October 2019 Question 32
ITPEC FE Morning October 2019 — Question 32 of 80
OSI Layer Devices — identify which network device operates at which OSI layer.
A repeater operates only at the physical layer (Layer 1) — it amplifies electrical signals without inspecting any addressing information.
Device-to-layer mapping:
- Layer 1 (Physical): repeater, hub — signal amplification only
- Layer 2 (Data Link): bridge, switch — forward frames using MAC addresses
- Layer 3 (Network): router — forward packets using IP addresses
Why not others:
- (a) Bridge — operates at Layer 2, uses MAC addresses to filter/forward frames
- (c) Router — operates at Layer 3, uses IP addresses for routing decisions
- (d) Switch — operates at Layer 2, uses MAC address tables for forwarding
Key rule: If the device only amplifies or regenerates signals without reading any address, it is Layer 1.
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