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Module 3: Network Layer & Routing

20242m

In specific, if the systems use separate protocols, which one of the following devices is used to link two systems?
(i) Repeater
(ii) Gateway
(iii) Bridge
(iv) Hub

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Correct answer: (ii) Gateway

A gateway connects networks or systems that use different protocols and can translate between those protocols, allowing otherwise incompatible systems to communicate.

  • Repeater: Operates at the physical layer and regenerates signals; it does not translate protocols.
  • Bridge: Operates at the data-link layer and forwards frames between LAN segments using compatible link-layer protocols.
  • Hub: A multiport repeater that sends incoming bits to its other ports; it does not perform protocol translation.

Exam tip: When a question specifically says that two systems use different protocols, the expected answer is generally Gateway.

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