Network+ Guide to Networks - Chapter 8

40 terms by summeranne Plus

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True

T/F: Wireless signals experience attenuation.

True

T/F: Spread spectrum is a popular way of making wireless transmissions more secure.

False

T/F: Wireless networks are laid out using the same topologies as wired networks.

False

T/F: If a station detects the presence of several access points, it will always choose the closest access point.

False

T/F: WiMAX is defined by the IEEE 802.11 standard.

frequency

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

single

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

diffraction

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

interference

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

fixed

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

active

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

sequence control

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

20

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

100

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

802.11n

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

channel bonding

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

frame aggregation

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

30

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

iwconfig

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

interference

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

100

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

geosynchronous orbiting

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

Ku-

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

asymmetrical

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

symmetrical

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

spread-spectrum

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

SSID

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

site survey

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.

hot spots

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

GEO

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

802.11g

Uses the 2.4-GHz frequency band and provides a maximum theoretical throughput of 54 Mbps.

802.11b

Uses DSSS (direct-sequence spread spectrum) signaling.

access point

Accepts wireless signals from multiple nodes and retransmits them to the rest of the network.

fixed wireless

The locations of the transmitter and receiver do not move.

mobile wireless

The receiver can be located anywhere within the transmitter's range.

802.11n

Boasts a maximum throughput of 600 Mbps.

downlink

Transmission from a satellite transponder to an earth-based dish-shaped antenna.

802.11a

Uses channels in the 5-GHz band and provides a maximum theoretical throughput of 54 Mbps.

uplink

The creation of a communications channel for a transmission from an Earth-based transmitter to an orbiting satellite.

802.11a

____ is the least popular WLAN standard.

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