ISRO PRL Technical Assistant CS/IT 2025

Detailed Explanation:

A router forwards packets between different IP networks.

It examines network-layer addressing information and uses a routing table to select the next hop or outgoing interface.

Detailed Explanation:

In a star topology, each node has a direct connection to a central device, such as a hub or switch.

Communication between nodes typically passes through that central device.

A central-device failure can disrupt the network, although an individual link failure usually affects only the connected node.

Detailed Explanation:

A keyboard is an input device because it allows users to enter text, numbers, and commands into a computer.

A monitor, printer, and speaker are output devices.

Therefore, the correct answer is Keyboard.

Detailed Explanation:

The Data Link Layer is OSI Layer 2.

It organizes bits into frames and supports node-to-node delivery over a link.

It commonly performs error detection (for example, using a frame check sequence); specific error-recovery functions depend on the link protocol.

Therefore, the correct answer is Data Link Layer.

Detailed Explanation:

In C, the -> operator accesses a structure or union member through a pointer.

For a pointer p to a structure, p->member is equivalent to (*p).member.

Therefore, the correct answer is ->.