Presenters: Faisal Shar Al-Shehri ID# 223036 Fahd Abdullah Al-Shehri ID# 235851 - PowerPoint PPT Presentation

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Presenters: Faisal Shar Al-Shehri ID# 223036 Fahd Abdullah Al-Shehri ID# 235851

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  1. King Fahd University of Petroleum and Minerals Electrical Engineering Department Presenters: Faisal Shar Al-Shehri ID# 223036 Fahd Abdullah Al-Shehri ID# 235851 Project: Wireless Local Area Network (WiFi) Date: 31 / 5 / 2008

  2. Outline • Introduction • Network Access Layer • Internet Layer • Transport Layer • How Wireless LAN works • Security Levels • Conclusion

  3. Introduction • Wireless LAN  TCP/IP suit • Brief Overview: • Practical and affordable. • Serve as wired LAN  ( without cables) • Basic principle: computers  each other  central server. (corporate environment)

  4. Introduction Some of the standards:

  5. Network Access Layer • Network Access Layer  ( physical & Data link) layers • Responsible  physical specification e.g ( frequency, R) • Most important hardware component  Access Point (AP)  Transparent Bridge

  6. Network Access Layer • Some of the protocols used: • RTS/CTS  avoid collision • Frame Relay  allow communication between LANs • ATM  used in high speed core

  7. Internet Layer • Internet Layer  ( Network Layer) • Responsible  determining  network path  computer data • The major device  router • Some of its protocols: • IP  facilitates the communication of info.  transport layer • ICMP  provide diagnostic & troubleshooting info  manage IP network

  8. Transport Layer • It has two main protocols: • UDP ( connectionless )  deals with time sensitive application.  reduce overhead in the packet header & ACK • TCP ( connection oriented )  grantee delivery by its mechanism ( packet numbering, ACK, windowing)

  9. How Wireless LAN works • Wireless LAN  depend on radio wave  in transmission • Transmitter (AP)  wired to an internet connection  by this  it provides “Hotspot”  transmits the connectivity over radio waves • “Hotspots” & SSID (Service Set Identifier) : • Identify Info • Allow computers to locate them

  10. How Wireless LAN works • Modes of Wireless LAN: • Ad-Hoc mode: • The wireless-enabled devices communicate with other without the use of AP. • Share files & other resources by this  the sharing devices have to be running all the time • Infrastructure mode: • This mode  uses APs • Devices on the network  available as long as they are directly connected to the wireless network • More secure the users have to verify their access through APs

  11. Security Levels • The most two important levels: • Level (I): • Basic level • Based on  Wired Equivalent Privacy (WEP) algorithm • Level (II): • Based on  WiFi Protected Access (WPA) • Better security technologies • Enforces data integrity

  12. Conclusion • Advantages: • easy to install and eliminate the need to pull cables through walls which results in lower costs • mobility where users can move in the coverage area without losing the connection • Disadvantages: • Wireless LAN can not be perfectly secured because the signal propagates everywhere • The medium is shared between the users which results in supporting a lower number of users.