Wireless Networking Chapter 23

Wireless Networking Components Infrared or radio waves Wireless access point (WAP) Power over Ethernet (PoE) Bluetooth tends to be built into PC Wireless Networking Software Carrier sense multiple access/collision avoidance (CSMA/CA) Request to Send/Clear to Send (RTS/CTS) (ACK) Wireless Network Modes Ad hoc mode Peer-to-peer Independent Basic Service Set (IBSS) Infrastructure mode Extended Basic Service Set (EBSS)

Wireless Networking Components Wireless Networking Security SSID – Service Set Identifier Network name Do not broadcast, but at least change Access point placement and radio power MAC Address Filtering Accepted user list WEP - Wired Equivalent Privacy Not end-to-end encryption 40 bit, possibly 104 bit Flawed

Wireless Networking Security WPA – Wi-Fi Protected Access Temporal Key Integrity Protocol (TKIP). New key per packet Encryption key integrity checking User authentication – Extensible Authentication Protocol (EAP) flawed WPA2 IEEE 802.11i standard followed Advanced Encryption Standard (AES) WPS – Wi-Fi Protected Setup Push button connection setup

Wireless Networking Components Speed and Range Issues Solid objects limit the range of the signal Signal strength and dropped packets will limits the data transfer rate

Wireless Networking Standards IEEE 802.11-based Wireless Networking Lower frequency has longer range 802.11a 5.8 GHz, 54 Mbps 802.11b 2.4 GHz, 11 Mbps 802.11g 2.4 GHz, 54 Mbps 802.11n Requires multiple antennas for (MIMO) multiple in/multiple out 2.4 GHz and 5.8 GHz, 100+Mbps Table 22-1

Wireless Networking Standards Other Wireless Standards Infrared Wireless Networking Infrared Data Association (IrDA) protocol 4 Mbps, 1 meter Page 960 Bluetooth Personal area networks (PANs) 1 Mbps or 3 Mbps 3 power/range classes 79 channels in 2.45 GHz range Cellular

Installing and Configuring Wireless Networking Wi-Fi Configuration Ad hoc mode Infrastructure mode Placing access points Omni-directional and Centered Gaining Gain The larger the antenna, the better the range Bluetooth Configuration Cellular Configuration