220 likes | 332 Views
Wireless LANs. Introduction. Types of Communication Networks. LAN’s Configurations. Wireless Technology. Definition. Applications. Example. Communications Area. - Problems: * Direct Connection of computers. * Huge Number of connections. - Solution * Networking.
E N D
Introduction • Types of Communication Networks. • LAN’s Configurations. • Wireless Technology. • Definition. • Applications. • Example. • Communications Area. - Problems: * Direct Connection of computers. * Huge Number of connections. - Solution * Networking.
How it Works • Brief Introduction. • Components of wireless Network. • Security.
Brief Introduction : • Wi-Fi Network. • Radio waves. • Mobile phones, TV and Walkie-Talky. • Similarities: • Sending and Receiving. • Converting 0’s and 1’s. • Differences: • Higher Frequencies. 2.4 GHz or 5 GHz
Components of Wireless Network: 1- Wireless Transmitter (wireless adapter). PC card slot USB port Built-in
Continued …….. 2- Wireless Router consisting of: - DSL or Cable port. - router. - Ethernet hup. - Firewall . - wireless access point.
* This Network works in the following way: • Data wireless adapter radio signal antenna wireless router signals decoding Ethernet connection information to the internet or other device.
Continued……. • The process also goes in reverse : Information router radio signal antenna adapter data used by the computer.
Security • Security is an important part of home wireless network. • Some precautions or methods should be used to keep the network private. - WEP - WPA - MAC
Wired Equivalency Privacy (WEP): • WEP key : numerical password . • Must be known to access the network. • WIFI Protected Access (WPA): • Development of WEP . • Part of 802.11i security protocol. • Like WEP, it uses a password.
Media Access Control (MAC): - very secure. • It uses different technology ( Address Filtering). • No use of password. • It uses computer’s physical hardware. • MAC addresses should be matched in order to access the network. - MAC addresses should be added to the list for new computers.
Wireless LANs 1] History 2] Standards & protocols Faisal Nawab
Why History? • A way of thinking • experience
The beginning of wireless communication • Gugliemo Marconi – 1896 • His goal? • A key to the gate
Beginning of Wireless LANs • Dr. Norman Abramson – 1970s • Major events since:- • 1980: first modems with 9600 bit/s • 1991: Wireless LAN workshop (why/results?) • 1990s: wireless hardware drop (benefits?)
ٍStandards and Protocols • Why standardization? • IEEE • 1990: 802.11 family
802.11 • 802.11: 2Mbps, 2.4GHz • 802.11a: 54Mbps, 5Ghz • 802.11b: 11Mbps, 2.4GHz • 802.11g: 54Mbps, 2.4GHz • IEEE 802.11-2007
802.11n • MIMO support • 500 Mbps
802.11s • Mesh networks • Why?
Thank you.. Questions?