Chapter 8: Wireless

Question 1

iwconfig

Answer 1

A command-line utility for viewing and setting wireless interface parameters on Linux and UNIX workstations.

Question 2

ESS

Answer 2

A group of access points and associated stations connected to the same LAN.

Question 3

4G

Answer 3

A mobile phone service which is characterized by an all-IP packet-switched network for both data and voice transmission.

Question 4

3G

Answer 4

A mobile phone service which specifies throughputs of 384 Kbps and packet switching for data (but not voice) communications.

Question 5

CSMA/CA

Answer 5

A network access method used on 802.11 where a node begins to send data only after it checks the medium (wire).

Question 6

GEO

Answer 6

A satellite that maintains a constant distance from a point on the equator at every point in its orbit. Used for satellite access to the Internet.

Question 7

DSSS

Answer 7

A transmission technique in which a signal’s bits are distributed over an entire frequency band at once.

Question 8

Ad Hoc

Answer 8

A type of wireless LAN in which stations communicate directly with each other rather than using an access point.

Question 9

SSID

Answer 9

A unique character string used to identify an access point on an 802.11 network.

Question 10

LOS (line of sight)

Answer 10

A wireless signal or path that travels directly in a straight line from its transmitter to its intended receiver.

Question 11

FHSS

Answer 11

A wireless signaling technique in which a signal jumps between several different frequencies within a band in a synchronization pattern known to the channel’s transceiver.

Question 12

WiMAX

Answer 12

All the 802.16 standards, such as 802.16e and 802.16m.

Question 13

Roaming

Answer 13

In wireless networking, the process that describes a station moving between BSSs without losing connectivity.

Question 14

MIMO

Answer 14

The ability for access points to issue multiple signals to stations, thereby multiplying the signals’ strengths and increasing their ranges and data-carrying capacities.

Question 15

1G

Answer 15

he first generation of mobile phone services. Entirely analog.

Question 16

2G

Answer 16

The first standard in mobile phone service to use digital transmission; paved the way for texting and media downloads.

Question 17

802.16

Answer 17

The IEEE standard for wireless MANs that may use frequencies between 2 GHz and 66 GHz, with a maximum throughput of 70 Mbps. Also known as WiMax.

Question 18

802.11g

Answer 18

The IEEE standard for wireless networking designed to be compatible with previous standards, with a maximum throughput of 54 Mbps. Uses 2.4MHz frequency.

Question 19

802.11n

Answer 19

The IEEE standard for wireless networking that may issue signals in the 2.4 GHz or 5 GHz band and can achieve actual data throughput between 65 Mbps and 600 Mbps.

Question 20

802.11b

Answer 20

The IEEE standard for wireless networking that uses DSSS signaling in the 2.4-2.4835 GHz frequency range, with a maximum throughput of 11 Mbps.

Question 21

802.11a

Answer 21

The IEEE standard for wireless networking that uses multiple frequency bands in the 5 GHz frequency range, with a maximum throughput of 54 Mbps.