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UGC NET CSE | June 2012 | Part 2 | Question: 5

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(A) Packets are the units of exchanging information in network. A bridge connects two or more networks, or segments of the same network.

(B)Switches are basically Bridges but usually have multiple ports.

(C)Bridge is a device used to connect two separate Ethernet networks into one extended Ethernet .

(D)Routers forward data packets from one place to another. They forward data depending on the network, not the hardware(MAC)address.

Hence,option (D)Router is the correct choice.

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Ans should be D 

A bridge is a device that connects and passes packets between two networksegments that use the same communications protocol. Bridges operate at the data link layer (layer 2) of the OSI reference model. A bridge will filter, forward or flood an incoming frame based on the MAC address of that frame.

A network switch (also called switching hub, bridging hub, officially MAC bridge) is a computer networking device that connects devices together on a computernetwork, by using packet switching to receive, process and forward data to the destination device.

Router

A device that forwards data packets along networks. A router is connected to at least two networks, commonly two LANs or WANs or a LAN and its ISP.s network. Routers are located at gateways, the places where two or more networks connect. Routers use headers and forwarding tables to determine the best path for forwarding the packets, and they use protocols such as ICMP to communicate with each other and configure the best route between any two hosts.

refer http://tech-lightenment.blogspot.in/2011/10/connecting-devices-hub-repeater-switch.html

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option C, Bridging is distinct from routing, which allows multiple different networks to communicate independently while remaining separate.
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