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Computer Network

Module 9

Ad hoc A type of wireless LAN in which stations communicate directly with each other (rather than using an access point)
Infrastructure A type of WLAN in which stations communicate with an access point and not directly with each other
Access Point A device used on wireless LANs that transmits and receives wireless signals and from multiple nodes and restransmits them to the rest of the network segment.
Service Set Identifier (SSID) A unique character string used to identify an access point on an 802.11 network.
Association In the context of wireless networking, the communication that occurs between a station and an access point to enable the station to connect tot he network via that access point.
Reassociation In the context of wireless networking, the process of a station establishing a connection (or associating) with a different access point.
Carrier Sense Multiple Access with Collision CSMA/CD A network access method specified for use by IEEE 802.3 (Ethernet) networks. In CSMA/CD, each node waits its turn before transmitting data to avoid interferring with other nodes' transmissions.
Directional Antenna A type of of antenna that issues wireless signals along a single direction, or path
Omnidirectional Antenna A type of antenna tht issues and receives wireless signals with equal strength and clarity in all directions.
Geosynchronous orbit or geostationary orbit (GEO) The term used to refer to a satallite that maintains a constant distance from a point on the equator at every point in its orbit.
Low Earth Orbiting (LEO) A type of satellite that orbits the Earth with an altitude between 100 and 900 miles, closer to the Earth's poles than the orbits of either GEO or MEO satellites.
Medium Earth Orbiting (MEO) A type of satellite that orbits the Earth rougly 6000 to 12000 miles above its surface, positioned between the equator and the poles.
Hot Spots An area covered by a wireless access point that provides visitors with wireless services, including Internet access
Line of sight (LOS) A wireless signal or path that travels directly in a straight line from its transmitter to its intended receiver.
War Driving The act of driving while running a laptop configured to detect and capture wireless data transmissions
Wired Equivalent Privacy (WEP) A key encryption technique for wireless networks that uses keys both to authenticate network clients and to encrypt data in transit
Wi-fi Protected Access (WPA) A wireless security method endorsed by the Wi-Fi Alliance that is considered a subset of the 802.11 standard.
WPA2 the name given to the 802.11 security standard by the Wi-fi Alliance.
Wi-Max 802.16. An IEEE standard for wireless MANs.
Wireless Broadband the term used to describe the recently release standards for high throughput, long-distance digital data exchange over wireless connections.
Wifi 802.11. The IEEE standard for a wireless network technique that uses multiple frequency bands in the 5-ghz frequency range and provides a theoretical maximum throughput of 54 mbps.
Created by: booaphi