PIN PARALLEL, AND VARIOUS OTHER CONNECTOR TYPES. ALLOWS FOR DATA AN...

25-pin parallel, and various other connector types. Allows for data and power with one cable.USB 2.0 Incorporates several changes to USB, including connector types. Data rates allow for a maximum speed of 480 Mbps.

V

virtual local area networks (VLANs) A logical separation of ports to define broadcast domains in a Layer 2 network, independent of their physical location.Virtual Private Network (VPN) Technology that allows for private communications over a public network infrastructure such as the Internet. A VPN creates a secure tunnel for the user and the connected endpoint.visual line of sight The ability of the transmitter and receiver to see each other.voltage standing wave ratio (VSWR) Disruption common in a wireless LAN system, caused by a mismatch in the impedance.

W

Wi-Fi Alliance Organization formed to promote IEEE standards for wireless LAN tech-nology and manufacturer interoperability testing.Wi-Fi interference Interference caused by other IEEE 802.11 wireless networks operating in the 2.4 GHz ISM or 5 GHz UNII bands.Wi-Fi Multimedia (WMM) A Wi-Fi Alliance certification designed as a proactive certifica-tion for the 802.11e QoS amendment to the 802.11 standard.Wi-Fi Multimedia Power Save (WMM-PS) A Wi-Fi Alliance certification designed for mobile devices and specific applications that require advanced power-save mechanisms for extended battery life.

38893bgloss.indd 442

5/18/09 4:09:17 PM

Glossary 443Wi-Fi Protected Access (WPA) A Wi-Fi Alliance certification designed as an interim solu-tion until an amendment to the 802.11 standard (802.11i) addressing security improve-ments was released.Wi-Fi Protected Access 2 (WPA 2.0) A post–IEEE 802.11i amendment Wi-Fi Alliance certification addressing advanced security options for IEEE wireless LANs.Wi-Fi Protected Setup (WPS) A Wi-Fi Alliance certification allowing SOHO users a sim-ple way to provide the best security possible for their deployments without the need for extensive technical knowledge of wireless networking.wind loading The effect of the force of wind on an antenna or other structure. In the case of an antenna, wind blowing at high speeds causes the antenna to move. Antennas designed for use in outdoor installations usually have a wind loading specification.Wired Equivalent Privacy (WEP) An optional authentication and/or encryption mecha-nism defined in the IEEE 802.11 standard designed to prevent casual eavesdropping. A weak and compromised legacy form of wireless security.wireless bridge Used to connect two or more local area networks together using radio frequency. Can be configured in either point-to-point or point-to-multipoint configurations.wireless controller/switch A device used in wireless LAN technology allowing central-ized administration and control of lightweight or thin access points, including radio man-agement, security, VLANs, and redundancy.wireless distribution system (WDS) A system that connects basic service sets together, making an extended service set using RF instead of cabling such as Ethernet.wireless hotspot A location that offers 802.11 wireless connectivity for devices (comput-ers, PDAs, phones, etc.) to connect to and access the Internet.wireless intrusion prevention system (WIPS) A software and/or hardware solution designed to monitor wireless networking RF signals using sensors or access points and record events to a centralized database. It has the capability to react and prevent intrusion.wireless LAN router Usually consists of an Internet port, small Ethernet switch, and wireless access point. Allows SOHO and residential users to connect devices to the network and access the Internet. Also known as wireless broadband router or wireless residential gateway.wireless mesh networking A self-forming, self-healing, intelligent network used to route data frames between access points or “nodes” with one or more of the access points con-nected to a network infrastructure.wireless repeaters Used to extend a radio frequency cell allowing users exceeding the connection distance of an access point to still be able to connect to a wireless LAN by repeating the signal to an access point.444 Glossarywireless VPN router Usually consists of a LAN port, Internet port, and wireless port. Allows wireless LAN devices to securely connect to an access point by utilizing Layer 3 security solutions.wireless workgroup bridge A wireless client device that allows several Ethernet devices on an Ethernet segment to associate and connect to a wireless infrastructure through an access point. Also known as a wireless client bridge.Wireless Zero Configuration (WZC) utility Wireless LAN adapter client utility built into the Microsoft Windows XP and Vista operating systems, and running as a service.wiring closet A central and secured location where cabling is terminated and connects to infrastructure devices such as Layer 2 switches and Layer 3 routers.

Y

Yagi antenna A semidirectional antenna typically used outdoors for short-range bridging or indoors for long hallways and corridors to provide RF coverage to a specific area.

38893bgloss.indd 444

5/18/09 4:09:17 PM

Index

Note to the reader: Throughout this index boldfaced page numbers indicate primary discussions of a topic. Italicized page

numbers indicate illustrations.

AID (association ID), 235

distance to

Numbers

and signal strength, 393

AirMagnet

and throughput, 395

Spectrum Analyzer, 288, 288,

3s and 10s Rule, 120

enterprise, 34 – 37, 35

294 – 298, 296

10BASE-T, 48

active site survey, 305

exam essentials, 52

64QAM (quadrature amplitude

floor plan marked with, 300, 300

Devices tab, 297

modulation), 384

installation dialog box, 295,

installation limitations, 327

100BASE-T (Fast Ethernet), 48

lightweight, 38, 38, 44

295 – 296