Wireless Networking. What are the advantages to wireless networking?. How has society changed?. What are the disadvantages to wireless networking?. Are there health concerns?. Components of a Wireless Network. Wireless network card Network card w/ an antenna Wireless router or access point
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What are the advantages to wireless networking? • How has society changed?
What are the disadvantages to wireless networking? • Are there health concerns?
Components of a Wireless Network • Wireless network card • Network card w/ an antenna • Wireless routeror access point • Access point may be physically wired to a router • Signal • Strong enough signal to communicate • Stronger signals have less packet loss • Why do weak signals result in slower internet?
Vocabulary • WiFi • Trademarked name for marketing by Wireless Ethernet Compatibility Alliance (Wi-Fi Alliance) • IEEE 802.11b Direct Sequence • WiMAX (Worldwide Interoperability for Microwave Access) • Wi-Fi standard designed for 30-40 Mbit/s wireless transfer • WiMAX updated to 1 Gbit/s transfer • Based on IEEE 802.16 (wireless broadband standards) • 3G (3rd generation of mobile telecommunications tech) • Mobile data transfer standard • Future standards? • http://en.wikipedia.org/wiki/WiMAX#Competing_technologies
Network Security • Encryption Types • Wired Equivalent Privacy (WEP) • http://en.wikipedia.org/wiki/Wired_Equivalent_Privacy#Encryption_details • Wi-Fi Protected Access (WPA) • Extra safeguards to prevent encryption attacks • Hash function to mix the initialization vector (seed) and secret key • Sequence counter to prevent replay attacks • UserID and password • MAC address filtering • MAC address ~ Media Access Control address