Exam 14: Wireless Lans

The logical function that determines when a station operating within a BSS is permitted to transmit and may be able to receive PDUs.

In order to accelerate the introduction of strong security into WLANs,the Wi-Fi Alliance promulgated ____________ as a Wi-Fi standard.This set of security mechanisms eliminates most 802.11 security issues and was based on the current state of the 802.11i standard.

In October of 2011,a number of companies and industry groups formed the __________,whose objective is to promote high-speed optical wireless systems.

A station must maintain an association with the AP within its current BSS.Three services relate to this requirement: association,reassociation,and ___________.

__________ antenna architecture is the most important of the enhancements provided by 802.11n.

The smallest building block of a WLAN is a __________,which consists of some number of stations executing the same MAC protocol and competing for access to the same shared wireless medium.

A set of one or more interconnected BSSs and integrated LANs that appear as a single BSS to the LLC layer at any station associated with one of these BSSs.

Infrared LANs are an economic alternative to spread spectrum LANs.

The key advantages of the WLAN are that it eliminates the wiring cost and it accommodates mobile workstations.

The end result for 802.11 is a MAC algorithm called __________ that provides a distributed access control mechanism with an optional centralized control built on top of that.

The physical layer for IEEE 802.11 has been issued in _______ stages.

The most significant set of standards defining WLANs are those defined by the

A typical coverage area for a WLAN has a diameter of _________.

A significant problem when using wireless LANs or Bluetooth arises because other applications use the same frequency bands, which causes interference problems.

A station of this type either is stationary or moves only within the direct communication range of the communicating stations of a single BSS.

Bluetooth is an alternative name for WIFI.

Any entity that has station functionality and provides access to the distribution system via the wireless medium for associated stations.

The IEEE 802.11 MAC layer covers three functional areas: reliable data delivery, access control,and _________.

The typical coverage area for a wireless LAN is 300 to 500 meters.

When all the stations in the BSS are mobile stations,with no connection to other BSSs,the BSS is called an ___________.