NETWORKING CONCEPTS Computer Network A computer network consists of two or more computing devices that are connected in order to share data and resources. They can also share printers, modems and other peripheral devices like CD drive etc.
Types Of Network
WAN LAN MAN (Wide Area Network) (Local Area Network) (Metropolitan Area Network) Advantages of Networking
1. Efficient use of storage media 2. Preserving Information 3. Reduction in Hardware Cost 4. Efficiency: We can upgrade, modify and delete software easily. 5. Data Redundancy: No need to duplicate datas 6. Quickest Document Delivery Connections Between Computers
Physical wires/Cables Wireless
Components required for Network
Wired Network Wireless Network
➤ Network Card ➤ Router ➤ Networking Cables ➤ Wireless Network Cards ➤ Hubs and Switches Network Card to physically attach a computer to network. E.g. Ethernet Network Card
Networking Cable: Modern Ethernet cables uses twisted pair per cable containing eight wires, arranged in a special order with RJ-45 connector similar to telephone wire but a little bigger than it. It is crimped at both the ends Local Area Network •Two or more computers and peripheral devices are connected in •small area. Eg. office building, campus •No. of Computers 2-1000 •Data transmission speed is slow •Few data transmission errors
Metropolitan Area Network
•Larger than LAN •Spreads across a city •E.g. Cable Television Wide Area Network
•Connected through satellite or telecommunication signals. •E.g. Telecom system, ATM facility, Multinational bank •Data speed is fast •Larger data transmission error Network Security
To protect data and resources from access by unauthorised persons
Login Security Rights Security Give a unique login name and password Give rights like read only, Read-Write access or No access. a combination of rights can be given to the same user for different sets of data.