Networks

From Computer Science Wiki
Networks[1]
A computer network or data network is a telecommunications network which allows computers to exchange data. 

In computer networks, networked computing devices exchange data with each other using a data link. The connections between nodes are established using either cable media or wireless media. The best-known computer network is the Internet.

Network computer devices that originate, route and terminate the data are called network nodes. Nodes can include hosts such as personal computers, phones, servers as well as networking hardware. Two such devices can be said to be networked together when one device is able to exchange information with the other device, whether or not they have a direct connection to each other.

Computer networks differ in the transmission medium used to carry their signals, the communications protocols to organize network traffic, the network's size, topology and organizational intent.

Computer networks support an enormous number of applications such as access to the World Wide Web, video, digital audio, shared use of application and storage servers, printers, and fax machines, and use of email and instant messaging applications as well as many others. In most cases, application-specific communications protocols are layered (i.e. carried as payload) over other more general communications protocols.[2]

Big ideas in networking[edit]

Standards[edit]

There are certain standards you must know in order to complete IB diploma.

  • Identify different types of networks.
  • Outline the importance of standards in the construction of networks.
  • Describe how communication over networks is broken down into different layers.
  • Define the terms: protocol, data packet.
  • Explain why protocols are necessary.
  • Explain why the speed of data transmission across a network can vary.
  • Outline the advantages and disadvantages of wireless networks.
  • Describe the hardware and software components of a wireless network.
  • Describe the characteristics of wireless networks.
  • Explain how data is transmitted by packet switching.
  • Outline the characteristics of different transmission media.


  • Identify the technologies required to provide a VPN.
  • Evaluate the use of a VPN.
  • Explain why compression of data is often necessary when transmitting across a network.
  • Describe the different methods of network security.
  • Evaluate the advantages and disadvantages of each method of network security.

References[edit]

a group or system of interconnected people or things.

a group or system of interconnected people or things.

a group or system of interconnected people or things.

a group or system of interconnected people or things.

A unit of abstract mathematical system subject to the laws of arithmetic.

Provide an answer from a number of possibilities. Recognize and state briefly a distinguishing fact or feature.

Give a brief account.

Give a detailed account or picture of a situation, event, pattern or process.

Give the precise meaning of a word, phrase, concept or physical quantity.

Give a detailed account including reasons or causes.

Assess the implications and limitations; make judgments about the ideas, works, solutions or methods in relation to selected criteria.