To transfer data packets between two computer networks, a ________ is used.

Question

UnlockIAS · Accepted Answer

Correct — B (Router) or D (Gateway), both accepted. A Router reads the destination IP address of each data packet and forwards it along the best path between separate networks — this inter-network forwarding is its defining Layer-3 function. A Gateway is the broader term for any node that connects two networks (often running different protocols) and translates/passes data between them; in most home and office setups the router itself acts as the default gateway. Because both terms genuinely describe a device that moves packets between two distinct networks, MPPSC's key credited both B and D.

Why the other options are wrong — (a) A switch connects devices WITHIN a single local network (LAN) using MAC addresses at Layer 2 — it does not forward packets between two separate networks.  (c) A brouter is a hybrid bridge-router device, but it is not the standard term taught for basic inter-network packet transfer, so the key did not credit it.

Concept: Networking devices operate at different layers and connect different scopes. A Switch connects devices inside one LAN. A Router connects two or more distinct networks and forwards packets between them based on IP addresses (Layer 3). A Gateway is a network node that connects networks using different protocols or architectures, translating data as it crosses the boundary — the router in a home network is commonly also its gateway to the wider internet.

State PCS 2021 Q28 — Science & Technology PYQ with Answer

State PCS 2021 Q28 — Science & Technology PYQ with Answer