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 incorrect about IP addressing?

  1. IP address is of 32 bits, divided in four octets and each octet is of 8 bits, separated by a (.) dot.

  2. For IP addressing, number range is between 0-256.

  3. IP address is used for identifying the system and provides communication.

  4. IP address is a combination of network ID and host ID.

  5. IP address uses subnet mask to differentiate network ID from host ID.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For IP addressing, number range is between 0-255. Hence it is an incorrect statement.

Multiple choice

_____________ mode is the one in which one byte port address is provided after the opcode and the port address cannot be changed throughout the program execution.

  1. Variable port addressing

  2. Based indexed addressing

  3. Based indexed addressing with displacement

  4. Fixed port addressing

  5. Indirect addressing mode
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This I/O port addressing mode is the one in which one byte port address is provided after the opcode and the port address can't be changed throughout the program execution.

Multiple choice

Which of the following statements is incorrect about TCP/IP model?

  1. The TCP/IP model is a reference model.

  2. TCP/IP is an open standard, which means that one company does not control it.

  3. Application layer of TCP/IP model works similar to the application layers of application, presentation and session layers of OSI models.

  4. Application, transport, internet and network are four layers of TCP/IP model.

  5. The TCP/IP model defines the four communication functions that protocols perform.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is an incorrect statement. The TCP/IP model is a protocol model because it describes the functions that occur at each layer of protocols within the TCP/IP suite.

Multiple choice

Which of the following is incorrect about OSI model?

  1. OSI stands for Open System Internet.

  2. The OSI model is an internetwork reference model developed by the International Organisation for Standardisation (ISO).

  3. The OSI model is used for referring to the process of communication, not to regulate it.

  4. In OSI model, communication process begins at the application layer of the source and data is passed down to each lower layer to be encapsulated with the supporting data until it reaches the physical layer and is put out on the media.

  5. Each layer provides data services to the layer directly above by preparing information coming down the model or going up.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is an incorrect full form of OSI since OSI stands for Open Systems Interconnection.

Multiple choice

Ports 20 and 21 are used by

  1. FTP protocol

  2. Telnet

  3. Post Office Protocol

  4. Simple Mail Transfer Protocol

  5. Domain Name System
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

FTP protocol uses ports 20 and 21.

Multiple choice

Which of the following is a TCP protocol?

  1. Trivial File Transfer Protocol (TFTP)

  2. Internet Relay Chat (IRC)

  3. Routing Information Protocol (RIP)

  4. Real-Time Transport Protocol (RTP)

  5. Session Initiation Protocol (SIP)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is a TCP protocol.

Multiple choice

Which of the following is incorrect about TCP protocol?

  1. TCP protocol is a connection oriented protocol.

  2. TCP does not resend any data segments that are not acknowledged as being received at the destination.

  3. TCP does not pass data to the network until it knows that the destination is ready to receive it.

  4. TCP uses a mechanism of the three-way handshake, timers, acknowledgments and dynamic windowing to achieve reliable features.

  5. TCP provides congestion control through the use of flow control and dynamic window sizes.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is an incorrect answer since TCP manages the flow of the data and resends any data segments that are not acknowledged as being received at the destination.

Multiple choice

Which of the following is incorrect about UDP protocol?

  1. UDP is a connectionless protocol that provides the basic transport layer functions.

  2. UDP is transaction based protocol.

  3. UDP reassembles the data in the order that it was received and forwards it to the application.

  4. UDP has more overhead than TCP protocol.

  5. UDP stands for User Datagram Protocol.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is an incorrect statement. UDP has lower overhead than TCP since it is not connection oriented and does not provide the sophisticated retransmission, sequencing and flow control mechanisms.

Multiple choice

Which of the following is incorrect about IPv4 protocol?

  1. IPv4 is a Network Layer Protocol used as a basic protocol of the internet.

  2. IPv4 is a media independent protocol.

  3. The IPv4 protocol describes services and packet structure that are used to encapsulate UDP datagrams or TCP segments handed down from the transport layer of the OSI model.

  4. IPv4 is a reliable protocol.

  5. IPv4 is a connectionless protocol.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is an incorrect statement about IPv4 protocol.