Network
• A network is a collection of computers connected by communication channels that allows you to share information.
http://en.wikipedia.org/wiki/Computer_network
Standalone
• Is a computer software that can work offline. It does not require a network connection.
http://en.wikipedia.org/wiki/Standalone_software
LAN
• Local Area Network. Is a computer network that connects computers in a limited area.
http://en.wikipedia.org/wiki/Local_area_network
WAN
• Wide Area Network. Is a telecommunication network that covers a broad area.
http://en.wikipedia.org/wiki/Wide_area_network
LAN
Advantages 1. Easy to share devices
(printers & scanners)
2. Easy to share data (homework, pictures)
3. Cost is low for LAN setup
Disadvantages1. Required to be on at all
times
2. Each computer can be easy to access for hackers\
3. The area covered is limited.
http://wiki.answers.com/Q/What_are_the_advantages_and_disadvantages_of_having_a_LAN
Cabled LAN
• Cabled networks are faster and more secure. But it is a lot harder to set up than wireless LAN.
1. unshielded twisted pair 2. Shielded twisted pair3. Coaxial cable 4. Fibre optic cable
http://www.astahost.com/info/tcmfl-wired-lan-wireless.html
http://wiki.answers.com/Q/Different_types_of_cable_used_in_LAN
Hardware that is essential for a computer to be connected to LAN
• Router• Modem• Computer• Os system• Ethernet/fiber optics cables
http://en.kioskea.net/contents/configuration-reseau/creer-reseau-local.php3
LAN Topologies
• The computers on a local area network must be connected via some way of networking medium. This medium serves as the channel where the network signal is transmitted. It must has an appropriate layout.
3 structures of topologies
• Star topology: are all connected together
• Ring topology: are all connected in a loop
• Bus topology: connects all networked devices to a single continuous cable.
http://homepages.uel.ac.uk/u0212068/topologies.htm
BUS TOPOLOGY
Advantages• It’s easy to set up
and extended.
• Not very expensive.
Disadvantages• There’s a limit to the
central cable length.
• The efficiency decreases as more devices connect.
http://www.ianswer4u.com/2011/05/bus-topology-advantages-and.html#axzz1u58hLmiQ
STAR TOPOLOGY
Advantages • Easy to connect new
devices.
• Centralized management, easy to monitor all devices.
• Failure of one device doesn’t affect the rest.
Disadvantages• If centralized devices fails,
the rest fail.
• The size is very limited.
• If the server is slow, the devices will be slow.
http://www.buzzle.com/articles/star-topology-advantages-and-disadvantages.html
http://www.ianswer4u.com/2011/05/star-topology-advantages-and.html#axzz1u58hLmiQ
Wireless LAN
• A Wireless Local Area Network (WLAN) allows a mobile device to connect to a local area network through wireless (radio) connection.
http://searchmobilecomputing.techtarget.com/definition/wireless-LAN
WAN
• Wide Area Network is a telecommunication network that covers a broad are.
• EG: Internet. A WAN is a network, which spans a wide area and transmits data using common communication links such as telephone lines, microwave links, and satellite channels. The Internet is the most popular and largest Wide Area Network.
http://en.wikipedia.org/wiki/Wide_area_network
What is a Data Transmission
• Is the physical transfer of data, through a specific route that is set for it.
• EG: wireless communication channels, and the data is represented as an electromagnetic signal.
http://en.wikipedia.org/wiki/Data_transmission
Clients
• Is an application or system that accesses a service made available by a server.
http://en.wikipedia.org/wiki/Client_(computing)
Server
• A server is a computer program me running to serve the requests of other programs.
http://en.wikipedia.org/wiki/Server_(computing)
Client/server networks
• Is a relationship between two programs. The client makes a service request. The server fulfills this request.
http://searchnetworking.techtarget.com/definition/client-server
Peer-to-peer network
• Is a computer network where each computer in the network can act as a server or client, for other computers in the network, allowing information to be shared
http://en.wikipedia.org/wiki/Peer-to-peer
BANDWITH
• The amount of bits allowed to pass through the network.
Narrowband
• One that does not exceed any peripherals
• Refers to one way communication in which one side it’s the transmitter and the other is the receiver.
Half duplex line
simplex line
• Refers to a two way communication where only one side can transmit data
Full duplex line• Is a two way
communication, both sides can transmit and receive data at the same time