ITPEC FE Morning April 2020 Question 31
ITPEC FE Morning April 2020 — Question 31 of 80
Gateway vs Other Network Devices — identify device by OSI layer and function.
A gateway performs protocol conversion between different types of networks, operating at the transport layer (L4) and above in the OSI model.
Device–Layer mapping:
- L1 (Physical) — Repeater, Hub: amplify/broadcast signals
- L2 (Data Link) — Bridge, Switch: forward frames within the same network
- L3 (Network) — Router: route packets across networks using IP
- L4+ (Transport and above) — Gateway: convert protocols between different network types
Why not others:
- (a) Bridge — L2 device, connects segments of the same network, no protocol conversion
- (c) Repeater — L1 device, only amplifies signals
- (d) Router — L3 device, routes IP packets but does not convert between different protocol suites
Key rule: If the question mentions "protocol conversion" + "transport layer and above" → Gateway.
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