Wireless Network and Topology

Types

• WAMP -Wireless personal area networks 
  ○ Range up to 30feet
  ○ 802.15standard
  ○ Low power , easy to use, low cost. 
  ○ E.g. Bluetooth
  
• WLAN - Wireless local area networks
  ○ Range about 300 feet
  ○ More power consumption
  
• WMAN - Wireless metropolitan area network
  ○ Range-city or suburb
  ○ Most of the time uses licensed frequencies
  ○ E.g.WiMAX
  
• WWAN - Wireless wide-area network
  ○ Very large distance coverage
  ○ Uses licensed frequencies
  ○ GSM is the most common in the world. CDMA, int he US and Japan 
  ○ E.g. Mobile phones network 

Topologies

• Ad Hoc Mode
  ○ Share files between two or more computers
  ○ BSS-Basic Service Set
  ○ IBSS-Independent Basic Service Set-do not rely on any device. It is also called peer-to-pear 
  ○ Small number of devices connected
  ○ Collision and organizational issues 

• Infrastructure Mode
  ○ AP-Access Point. Also know as Hot Spot
  ○ BSA-Basic Service Area. Also know as Cell - Area coveraged by an individual AP                                          ○ SSID-Service Set Identifier.
  ○ BSSID - Basic Service Set Identifier. It is the AP's MAC address
  ○ DS-Distribution System-The wired part of the network that the AP can accessed                                            ○ WLC-Wireless LAN controller
  ○ ESS-Extended Service Set. Two or more APs
  ○ Roaming-when a device leaves one cell to another