Interconnecting dissimilar LANs: in a building with both Ethernet and Token Ring networks, which device enables communication between the different LAN architectures and protocols?

Difficulty: Easy

Correct Answer: Gateway

Explanation:


Introduction / Context:
Mixed environments may include LANs with different media access methods and frame formats (e.g., Ethernet vs. Token Ring). To share resources across these systems, you may need a device that can translate or interoperate across different protocols/architectures—not merely forward frames unchanged.


Given Data / Assumptions:

  • Ethernet and Token Ring differ at Layer 2 (frame formats, media access).
  • Some scenarios require protocol translation, name service mediation, or application-layer adaptation.
  • Goal: enable communications between dissimilar LANs, not just extend the same LAN type.


Concept / Approach:
A gateway performs protocol conversion and higher-layer mediation so endpoints on different LAN architectures can interoperate. In contrast, a bridge forwards frames within the same Layer 2 protocol family; a router forwards at Layer 3 but does not translate between incompatible Layer 2 protocols by itself; a repeater operates at Layer 1 and cannot resolve protocol differences. Therefore, the correct choice for “dissimilar LANs using different protocols” is a gateway.


Step-by-Step Solution:

Identify that the LANs are dissimilar at Layer 2.Eliminate L1/L2 devices that only forward signals/frames.Select “Gateway” for protocol/architecture translation.


Verification / Alternative check:
Historical solutions included multi-protocol gateways and application gateways to integrate Ethernet and Token Ring segments for file/print services.


Why Other Options Are Wrong:

Bridge: same-protocol Layer 2 forwarding; not cross-architecture translation.Router: IP-layer forwarding only; does not address L2 incompatibilities by itself.Repeater: signal regeneration only.None of the above: incorrect because “Gateway” fits.


Common Pitfalls:
Assuming routers solve all interconnection problems; routers do not convert frame formats or application protocols.


Final Answer:
Gateway.

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