Computer Knowledge

Computer Networks

2,614 Questions

Computer networks involve the architecture, protocols, and security measures used for digital communication. This collection covers OSI model layers, IP addressing, data transmission, and cryptographic standards. These concepts are vital for the computer knowledge sections of banking and government exams.

OSI model layersNetwork protocolsIP subnet maskingData encryption standardsServer configurationsNetwork commands

Computer Networks Questions

Multiple choice

Which of the following is a wrong example of network layer?

  1. Internet Protocol (IP) - ARPANET

  2. X.25 Packet Level Protocol (PLP) - ISO

  3. Source Routing and Domain Naming - USE NET

  4. X.25 level 2-ISO
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

X.25 Level 2 (LAPB) operates at the data link layer, not the network layer. The network layer includes protocols like IP and X.25 PLP.

Multiple choice

Which class of IP address is reserved for future use?

  1. Class A

  2. Class C

  3. Class B

  4. Class E

  5. Class D
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Currently we are using Class A, Class B, Class C IP address for routing and switching and Class D is used for multicasting. Class E is reserved for future use. So, this option is correct.

Multiple choice

What is the range of host address of Class A IP?

  1. 1.1.0.0 to 128.255.255.255

  2. 1.0.0.0 to 126.255.255.255

  3. 1.0.0.0 to 191.255.255.255

  4. 0.0.0.1 to 127.255.255.255

  5. 1.0.0.0 to 127.255.255.255
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The range of host address in class A IP address is 1.0.0.0 to 127.255.255.255. So, this option is correct answer.

Multiple choice

A computer has IP address 192.168.10.128, then which part of this IP address represents network address?

  1. 192.168

  2. 192.168.10

  3. 192

  4. IP address represents only Host address, it does not represent network address.

  5. IP address does not represent computer address and network address.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The given IP address is of class C. Class C has 24 bit network address. The given network address is 192.168.10, which is 24 bit. So, this option is correct.

Multiple choice

Which of the following ensures that message passing system is easy to use?

  1. Syntax of remote communication and local communication protocols must be as close as possible.

  2. Semantics of remote communication and local communication protocols must be as close as possible.

  3. Semantic of remote communication and local communication protocols must be as different as possible.

  4. Syntax of remote communication and local communication protocols must be as different as possible.

  5. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The closeness of the two protocols (remote & local) ensures that the message passing system is easy to use.

Multiple choice

Header of a message had a relevant address and structural information when it is sent in interprocess communication and so it should be received by the receiver, but it does not reach to the receiver. Which of the following explains the reason of this failure?

  1. Some transmission problem must have occured. Otherwise there was not any mistake.

  2. Structural information was not in proper form.

  3. Address was wrong.

  4. Sequence no. was missing.

  5. Both 1 and 2

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, the sequence no. was necessary to locate the recipient. The header must have minimum three information: 1. address of recipient, 2. sequence no. and 3. structural information.

Multiple choice

Which of the following correctly defines implicit addressing in message based communication?

  1. The process with which the communication is desired is explicitly named as a parameter in communication primitive.

  2. Send (process_id, message) and receive (process_id,message)

  3. Send_any (service_id,message) and receive_any (process_id,message)

  4. Both 2 and 3

  5. Send(service_id,message) and receive (process_id,message)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This process is implicit addressing where sender can be anyone within the group.

Multiple choice

Which of the following correctly defines how reliable IPC protocol of a message passing system copes with the failure in recovering the message?

  1. By waiting for the acknowledgment message from receiver

  2. By using internal re-transmission of message after timeout

  3. Both 1 and 2

  4. By providing parity codes with the transmitting message

  5. Options 1, 2 and 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

IPC protocol copes with the failure by using internal re-transmission mechanism. After timeout, the message is re-transmitted and the return of an acknowledgment message to the sending machine's Kernel by receiving mode. Now, the sender can clearly identify if the receiver is down or not.