network2 Ch. 8

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____________________ means that satellites orbit the Earth at the same rate as the Earth turns.

Geosynchronous orbit

____ is a command-line function for viewing and setting wireless interface parameters and it is common to nearly all versions of Linux and UNIX.

iwconfig

In ____, a wireless signal splits into secondary waves when it encounters an obstruction.

diffraction

____ is an 802.11n network feature allowing the combination of multiple frames into one larger frame.

Frame aggregation

If intermittent and difficult-to-diagnose wireless communication errors occur, ____ might be the culprit.

interference

The ______________________________ is a unique character string used to identify an access point.

SSID

In wireless communication, to exchange information, two antennas must be tuned to the same ____.

frequency

The use of multiple frequencies to transmit a signal is known as ____________________ technology.

spread-spectrum

An 802.11g antenna has a geographic range of ____ meters.

100

____ is the least popular WLAN standard.

802.11a

Satellite return Internet access is a(n) ____ technology.

symmetrical

Using Bluetooth version 2.0, communicating nodes can be as far as ____ meters apart.

30

Places where wireless Internet access is available to the public are called ____________________.

hot spots

A unique characteristic of the 802.11 data frame is its ____ field.

Sequence Control

Satellite Internet access providers typically use frequencies in the C- or ____ bands.

Ku-

A directional antenna issues wireless signals along a(n) ____ direction.

single

____ satellites are the type used by the most popular satellite Internet access service providers.

Geosynchronous orbiting

In ____ wireless systems, the result is a point-to-point link.

fixed

____ may use either the 2.4-GHz or 5-GHz frequency range.

802.11n

A(n) ____________________ assesses client requirements, facility characteristics, and coverage areas to determine an access point arrangement that will ensure reliable wireless connectivity within a given area.

site survey

The average geographic range for an 802.11a antenna is ____ meters.

20

____ is a most significant problem for wireless communications because the atmosphere is saturated with electromagnetic waves.

Interference

Dial return satellite Internet access is a(n) ____ technology.

asymmetrical

In ____ scanning, the station transmits a special frame, known as a probe, on all available channels within its frequency range.

active

____ is an 802.11n feature that allows two adjacent 20-MHz channels to be combined to make a 40-MHz channel.

Channel bonding

LEO satellites orbit the Earth with an altitude as low as ____ miles.

100

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