Computer Knowledge

Computer Networks

2,095 Questions

Computer networks form the backbone of digital communication, connecting multiple devices to share data and resources. This area covers network architectures, transmission media, modems, and topologies like LAN. These concepts are crucial for computer knowledge sections in banking and government exams.

Network topologiesModulation and demodulationNetwork addressingFiber optic cablesWireless infrastructure

Computer Networks Questions

Multiple choice

Which of the following is not true about domain logical topology?

  1. Domain is a collection of computers connected together with a server and users.

  2. It is suitable for smaller networks/organisations.

  3. Domain logical topology can have servers like UNIX, Novell NetWare, WIN-NT server, 2000 server and 2003 server.

  4. It provides centralised administration.

  5. Domain offers security and provides logon authentication.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Domain logical topology is a collection of computers connected together with a server and users which is based on client server model. A client server model can be implemented on large organization hence it is incorrect statement.

Multiple choice

When a message exchange is _____, both the sender and the receiver must come together to complete the transfer.

  1. synchronous

  2. asynchronous

  3. congruous

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In synchronous message passing, the sending process blocks until the receiving process is ready to accept the message. This rendezvous requires both processes to be actively involved at the same time. Asynchronous messaging allows the sender to continue without waiting.

Multiple choice

With _______ message exchange(s), the sender is not blocked when there is no outstanding RECEIVE.

  1. synchronous

  2. asynchronous

  3. both (1) and (2)

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Asynchronous message passing allows the sender to continue execution immediately after sending, without blocking for a corresponding receive operation. The system typically buffers messages until the receiver retrieves them. Synchronous messaging would block the sender.

Multiple choice

Channel, encoder, decoder, transmitter and receiver are main elements of network communication. Which of the following is the correct sequence of the given elements?

  1. Channel - Encoder - Decoder - Transmitter - Receiver

  2. Encoder - Transmitter - Channel - Decoder - Receiver

  3. Encoder - Channel - Transmitter - Decoder - Receiver

  4. Encoder - Transmitter - Channel - Receiver - Decoder

  5. Transmitter - Encoder - Channel - Decoder - Receiver
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is the correct sequence. In this process, a message is encoded by the encoder, which is transmitted by the transmitter. After that, through the channel it is sent to the decoder where decoder decodes that message and sends it to the the receiver.

Multiple choice

Which of the following is not a characteristic of controlled access MAC method?

  1. Only one station transmits at a time.

  2. Devices wanting to transmit FDDI must wait for their turn.

  3. Some networks use token passing.

  4. Collisions exist in this method.

  5. Token Ring and FDDI use this method.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is not a characteristic of controlled access MAC method since there is no collision in this method.

Multiple choice

Which of the following topologies is highly reliable?

  1. Star

  2. Bus

  3. Fully connected Mesh

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A fully connected mesh topology provides the highest reliability because every node has a direct connection to every other node. If any single link fails, communication can still occur through alternative paths. Star topology fails if the central hub fails, bus topology fails if the backbone is cut, and ring topology fails if any link breaks.

Multiple choice

Which of the following topologies is not broadcast type?

  1. Star

  2. Bus

  3. Ring

  4. Tree
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ring topology is not broadcast because data flows sequentially from one node to the next in a unidirectional manner. Each node receives and forwards the signal to its single downstream neighbor. In contrast, star and tree broadcast from the central node, and bus broadcasts on the shared medium to all connected nodes simultaneously.

Multiple choice

Which of the following is used for modulation and demodulation?

  1. Protocols

  2. Gateway

  3. Modem

  4. Multiplexer

  5. _
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is a device that enables a computer to transmit data through telephone or other communication lines. Modem converts its digital signal into analog signals. It is used in modulation and demodulation.