Computer Networks S3 Prepared by May Lau

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Presentation transcript:

Computer Networks S3 Prepared by May Lau http://www.bbc.co.uk/schools/gcsebitesize/ict/datacomm/2networksrev1.shtml

What is computer network? Flash Animation http://www.bbc.co.uk/schools/gcsebitesize/ict/datacomm/2networks_act.shtml

What is computer network? A computer network is A number of computers linked together. To allow them to share resources. Can share hardware, software and data. Most computer networks have at least one server Powerful computer Provides one or more services to a network and its users A server is a powerful computer that provides one or more services to a network and its users. For example, file storage and email.

LANs and WANs Flash Animation http://minisite.proj.hkedcity.net/sec-te/cht/topics/network_lanwan/index.html

LANs and WANs There are two main types of network: Local Area Network (LAN) Wide Area Network (WAN)

LAN A LAN covers a small area such as one site or building, eg a school or a college.

WAN A WAN covers a large geographical area. Most WANs are made from several LANs connected together.

Examples of LAN & WAN The Internet is a WAN. A network of bank cash dispensers is a WAN. A school network is usually a LAN. LANs are often connected to WANs, for example a school network could be connected to the Internet. WANs can be connected together using the Internet, leased lines or satellite links.

Advantages and disadvantages of networks

Advantages of networks Sharing devices Sharing software Sharing files Communication Security is good Data is easy to backup (Central Management)

Disadvantages of networks Purchasing the network cabling and file servers can be expensive. Managing a large network is complicated If the file server breaks down the files on the file server become inaccessible. Viruses can spread to other computers throughout a computer network. There is a danger of hacking, particularly with wide area networks. Security procedures are needed to prevent such abuse, eg a firewall.

What hardware and software for the computer network?

Hardware and Software Cable Network Card Broadband Router Wireless Network Adapter Router src: http://resources.hkedcity.net/resource_detail.php?rid=273116403

Activity Computer Networking Hardware and Software Group of 5 Prepare a presentation on “Computer Networking Hardware and Software” Guideline: What is computer network? What hardware should be used to construct the computer network? (At least 5) What software should be used to manage the computer network?