Computer Networks - hkedcity.net

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 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 Router Network Card

Broadband Router Wireless Network Adapter 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?