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

Data-Links layer that are described in the IEEE-802 LAN standards are

  1. MAC/LLC

  2. IPv4/IPv6

  3. TCP/UDP

  4. Linux/Windows
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The IEEE 802 standards define the Data Link layer by splitting it into two sublayers: the Logical Link Control (LLC) and the Media Access Control (MAC). Other options list protocols or operating systems, not sublayers.

Multiple choice

In the OSI Model, UDP protocol resides at which layer?

  1. Physical

  2. Datalink

  3. Network

  4. Transport
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

UDP (User Datagram Protocol) is a connectionless protocol that operates at the Transport layer (Layer 4) of the OSI model, providing end-to-end communication services.

Multiple choice

What is the correct order of the 7 layers of the OSI Model?

  1. Appl, Presentation, Session, Trans, Net, Data Link, Physical

  2. Appl, Presentation, Session, Data link, Net, Trans, Physical

  3. Appl, Presentation, Session, Net, Data link, Trans, Physical

  4. Appl, Presentation, Session, Physical, Data link, Net, Trans
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The standard OSI model order from top to bottom is Application, Presentation, Session, Transport, Network, Data Link, and Physical. Option A correctly lists this sequence.

Multiple choice

Which three layers of the OSI Model make up the upper layers?

  1. Application, Presentation, Session

  2. Presentation, Session, Transport,

  3. Session, Transport, Network

  4. Transport, Network, Data Link
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The OSI model is divided into upper layers (Application, Presentation, Session) which deal with user-facing data, and lower layers (Transport, Network, Data Link, Physical) which deal with data transmission.

Multiple choice

Which description about IPv6 is not correct?

  1. IPv6 supports a hop limit of 255

  2. IPv6 interfaces must have a link-local address

  3. IPv6 natively incorporates IPSec

  4. IPv6 supports broadcasting
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

IPv6 does not support broadcasting; instead, it uses multicasting and anycasting to send data to specific groups or the nearest interface.

Multiple choice

Select the incorrect statement about higher level OSI layers

  1. Session - maintains the state of the ongoing connection

  2. Presentation - Encryption & Translation can occur at layer 6

  3. Application - resource sharing, remote file access and other

  4. Transport - transmission of packets
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Transport layer is considered a lower layer, not a higher layer. The higher layers are Session, Presentation, and Application.

Multiple choice

What statement about IPv6 packet fragmentation is true?

  1. IPv6 fragmentation occurs at the routers

  2. IPv6 packet size is pre-determined on the sending host

  3. IPv6 MTU is hard set to 1500

  4. IPv6 fragmentation occurs at switches
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In IPv6, routers do not perform fragmentation. Fragmentation is the responsibility of the source host, which determines the MTU and fragments the packet accordingly.

Multiple choice

Which layer - PDU match is incorrect?

  1. Network - Datagram

  2. Physical - bits

  3. Data Link - Frame

  4. Transport - Segment
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The PDU for the Network layer is a Packet, not a Datagram (though sometimes used interchangeably, Packet is the standard OSI term). However, in many contexts, Datagram is associated with Transport (UDP). Actually, the Network layer PDU is a Packet, so the match 'Network - Datagram' is technically incorrect in strict OSI terminology.

Multiple choice

Two common layer three protocols are:

  1. Ethernet and TCP

  2. ICMP and IPv6

  3. UDP and TCP

  4. IPv4 and STP
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

ICMP and IPv6 are both protocols that operate at the Network layer (Layer 3).