Key facts

  • A computer network is a group of interconnected computers or devices that share data, applications, hardware and other resources.
  • Network coverage is commonly classified as PAN, LAN, MAN and WAN; the Internet is the largest WAN.
  • An IP address is the unique network identifier of a device; IPv4 is 32-bit, while IPv6 is 128-bit.
  • Network topology describes the physical or logical arrangement of devices; star topology uses a central switch and is common in modern networks.
  • TCP/IP is the foundation of Internet communication: TCP supports reliable delivery, while IP handles addressing and routing.

Key Points at a Glance

  1. 1

    A computer network is a group of interconnected computers or devices that share data, applications, hardware and other resources.

  2. 2

    Network coverage is commonly classified as PAN, LAN, MAN and WAN; the Internet is the largest WAN.

  3. 3

    An IP address is the unique network identifier of a device; IPv4 is 32-bit, while IPv6 is 128-bit.

  4. 4

    Network topology describes the physical or logical arrangement of devices; star topology uses a central switch and is common in modern networks.

  5. 5

    TCP/IP is the foundation of Internet communication: TCP supports reliable delivery, while IP handles addressing and routing.

  6. 6

    DNS translates domain names such as google.com into IP addresses and is often called the phone book of the Internet.

  7. 7

    5G is the fifth-generation mobile network, with theoretical peak download speed of 20 Gbps, latency as low as 1 millisecond in ultra-low-latency scenarios and support for dense IoT connectivity.

BASIC COMPUTER INSTRUCTOR study hubView study packs

Meaning and Scope of Computer Networks

A computer network connects two or more computers or digital devices so that they can exchange data and share resources. In an office, a network allows users to share files, printers, storage, software and Internet access. In a wider setting, networks allow devices across buildings, cities and countries to communicate through standard rules and addressing systems.

For an objective computer-instructor paper, the main exam focus is not advanced network engineering. The candidate should be able to identify the meaning of a network, the coverage-based types of networks, the role of IP addresses and protocols, and the practical difference between a local network and the Internet. Networking also supports later topics such as cloud computing, Internet of Things and mobile data services.

Remember the core idea: a network is built for communication and resource sharing, not merely for placing computers in the same room.

Open the complete note

This public page shows the first available section. The study pack opens the complete topic with all revision material.

7 more sections in the complete note

Open study pack