Task: Learning Journal

Open your Learning Journal by clicking on the image below

Good notes will help you organise and process data and information

Computer Networks

A computer network can be described as two or more computers connected together to share resources. The purpose of a computer network is to allow computers to exchange information and data. A Networked computer can also use the resources of other computers on the network.

A network is a group of devices connected together, wirelessly or using cables, so that they can communicate with each other and share resources. Networks can be structured in different ways (called topologies), and may also be categorised as client–server or peer-to-peer networks. There are benefits and drawbacks to each approach.

Network standards and protocols allow a wide range of devices from different manufacturers to communicate with each other. The speed at which a network operates is important to most users and you will learn about the factors that impact a network's performance. Network security is covered separately in the security topic.

Advantages and Disadvantages of Computer Networks

Advantages:

• A network allows users to share software stored in a main system.
• Files can easily be shared between users over a network.
• Network users can communicate via email, instant messenger, and VoIP.
• Within networks, it is much more straightforward to backup data as it is all stored on the file server.
• Networks allow data to be transmitted to remote areas that are connected within local areas.
• Networking computers allows users to share common peripheral resources such as printers, fax machines, etc. therefore saving money.

Disadvantages:

• Purchasing cabling to construct a network as well as the file servers can be costly.
• The management of a large network is complicated, which requires training, and a specialist network manager usually needs to be employed.
• In the event of a file server breaking down the files contained on the server become inaccessible, although email might still work if it is stored on a separate email server. The computers can still be used but are isolated.
• If a virus gets into the system through a network it can easily spread to other computers.
• There is a risk of hacking, particularly with wide area networks. Stringent security measures are required to prevent such abuse, such as a firewall.

Task:

Open your student workbook at page 4 Read through the notes then complete the following task in your book.

1. Task 1

When you are finished screenshot your answer into your Learning Journal