ICT
Computing
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LO 3 - Understand Business IT Systems

Computer_Networks

Computer Network Types

A system of interconnected computers and computerized peripherals such as printers is called a computer network. This interconnection among computers facilitates information sharing among them. Computers may connect to each other by either wired or wireless media.Generally, networks are distinguished based on their geographical span. A network can be as small as distance between your mobile phone and its Bluetooth headphone and as large as the internet itself, covering the whole geographical world. Source - www.tutorialspoint.com

Computer_Networks

Computer Network Types

A system of interconnected computers and computerized peripherals such as printers is called a computer network. This interconnection among computers facilitates information sharing among them. Computers may connect to each other by either wired or wireless media.Generally, networks are distinguished based on their geographical span. A network can be as small as distance between your mobile phone and its Bluetooth headphone and as large as the internet itself, covering the whole geographical world. Source - www.tutorialspoint.com

troubleshooting

3. 4 Connectivity Methods



What is a network?

A network is two or more computers (or other electronic devices) that are connected together, usually by cables or Wi-Fi.

Network Card

Computer_Networks

Allows communication between computers in a LAN.

Some computer networks will have a server. A server is a powerful computer that often acts as a central hub for services in a network, eg emails, internet access and file storage. Each computer connected to a server is called a clien.

A computer that is not connected to a network is called a standalone computer.

What are the benefits of a network?

Using a network allows you to share:

  • hardware, such as a printer
  • software, allowing multiple users to run the same programs on different computers
  • data, so that other people can access shared work and you can access your data from any computer on the network

Networking is critical if you want to use your computer to communicate. Without it you couldn’t send an email, a text or an instant message.

We use a huge network on a daily basis and this is called the internet. Around three billion people use the internet to share data, news and resources, amongst many other things.

What problems can occur with a network?

If we connect computers or devices together in a network we can expose ourselves to some problems.

If the network breaks, this can make a number of tasks it is used for quite difficult. For example, it might not be possible to share photographs and opinions with friends.

If computers and devices are networked together, we can expose ourselves to hackers and viruses. Most viruses are spread over a network and most hackers use a network to access other people's computers. Without a network connection, a hacker would have to physically get to your computer.

Types of network

There are two main types of network:

  • a local area network (LAN)
  • a wide area network (WAN)

Local area network (LAN)

A Local Area Network is when computers or devices are connected together over a small geographical area, such as within a home, a building or one site. A LAN can be created to share data or hardware such as a printer, or to share an internet connection.

LAN network diagram

Wide area network (WAN)

A Wide Area Network is when computers or devices are connected together over a large geographical area. For example, a company with an office in London and another in Beijing would use a WAN to allow the employees to share one network. Some companies will connect a number of LANs in different areas together to create a WAN. The biggest WAN we know is the internet.

WAN network diagram

Metropolitan area network (MAN)

A Metropolitan Area Network A metropolitan area network (MAN) is a high-speed network that connects local area networks in a metropolitan area such as a city or town and handles the bulk of communications activity across that region. It generally expands throughout a city e.g. through a cable TV network. It can be in the form of Ethernet,Token-ring, ATM, or Fiber Distributed Data Interface (FDDI).

WAN network diagram

Tasks

  1. Explain the purpose and characteristics of LAN (Ethernet, Token Ring)
  2. Explain the purpose and characteristics of WAN (ADSL, leased line, ISDN)
  3. Explain the purpose and characteristics of MAN
  4. Explain the purpose and characteristics of of voice (PSTN, cellular)
  5. Explain the purpose and characteristics of of satellite (voice, data)


  • Learning Objectives

  • I can explain the purpose of LAN (Ethernet, Token Ring)
  • I can explain the purpose of WAN (ADSL, leased line, ISDN)
  • I can explain the purpose of MAN
  • I can explain the purpose of voice (PSTN, cellular)
  • I can explain the purpose of satellite (voice, data)
  • I can explain the characteristics of all of the above
Computer_Networks

Computer Network Types

A system of interconnected computers and computerized peripherals such as printers is called a computer network. This interconnection among computers facilitates information sharing among them. Computers may connect to each other by either wired or wireless media.Generally, networks are distinguished based on their geographical span. A network can be as small as distance between your mobile phone and its Bluetooth headphone and as large as the internet itself, covering the whole geographical world. Source - www.tutorialspoint.com