Exam 13: Wireless Lans

IEEE 802.11 defines three services that provide a wireless LAN with secure access and privacy services: authentication,privacy,and ________.

Currently the most popular type of wireless LAN uses ________ techniques.

An individual cell of an IR LAN is limited to a single room because infrared light does not penetrate opaque walls.

Enabling an employee returning from a trip to transfer data from a personal portable computer to a server in the office is an example of Nomadic access.

For higher speeds,a technology known as ________ is superior to spread spectrum.

The three MAC frame types are control frames,data frames,and ________ frames.

The popularity of wireless LANs has not grown significantly because the problems of high prices,low data rates,occupational safety concerns,and licensing requirements have not been addressed.

Currently wireless LAN products fall into three categories: spread spectrum LANs,OFDM LANs and ________ LANs.

In most cases,spread spectrum LANs operate in the ________ microwave bands so that no Federal Communications Commission licensing is required for their use in the United States.

IEEE ________ embodies changes in three general areas: use of MIMO, enhancements in radio transmission,and MAC enhancements.

A wireless LAN linked into a wired LAN on the same premises is referred to as a LAN ________.

Three physical media are defined in the original 802.11 standard: DSSS, FHSS,and ________.

The ________ standard defines a set of services and physical layer options for wireless LANs.

"Recommended practice for the evaluation of 802.11 wireless performance" is the scope of the ________ standard.

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

The IEEE 802.11 physical layer covers a limited range of data rates.

A wireless LAN must meet the same sort of requirements typical of any LAN,including high capacity,ability to cover short distances, full connectivity among attached stations,and broadcast capability.

A number of changes are made in 802.11n in the radio transmission scheme to increase capacity.The most significant of these techniques is ________.

In the IEEE 802 physical layer frame format the ________ field enables the receiver to acquire an incoming OFDM signal and synchronize the demodulator.

________ access provides a wireless link between a LAN hub and a mobile data terminal equipped with an antenna,such as a laptop computer or notepad computer.