Q 6,paper 2,June 12. Both Hosts and routers are the TCP/Ip protocol softwares. How ever routers does not use protocols from all layers. The layer for which protocol software is not needed by a router is

Options (A) layer 5 Application Layer       (B)Layer 1 Physical layer                                (C) layer 3 Internet layer(D)Layer 2 Network interface.

Answer (A) layer 5 Application layer.

Explanation.

Passive hubs works below the physical layer.

Active hub works on the physical layer.

Bridge or two layer switch works on physical and data link layer.

Router or three layer switch works on the physical ,data link and network layer.

Gateway works on the all the five layers.