Deck 14: Wireless Wans

Question 1

Which of the following is NOT one of the ways that frequency spectrum can be divided among active users?

A)frequency division multiple access
B)time division multiple access
C)code division multiple access
D)space division multiple access
E)cell division multiple access

Answer 1

E

Question 2

In cellular communications systems,base stations (BS)are located in the geographic center of cells and handle communications between mobile units and the rest of the network.

Answer 2

True

Question 3

The base station selected for communication with a mobile unit is always the one closest to the current location of the unit.

Answer 3

False

Question 4

First generation mobile telephone systems used analog voice communication based on amplitude modulation.

Question 5

Because of the limited frequencies available,a key design element of any cellular system is to

A)use small cells.
B)employ multiple access.
C)limit the number of users at one time.
D)use as many frequencies as possible.
E)use as few frequencies as possible.

Question 6

Prior to cellular radio,mobile radio and telephone services required

A)a high-power transmitter/receiver.
B)multiple transmitters/receivers.
C)only one or two dedicated channels.
D)that many channels be used,which exceed the frequency capacity.
E)wired networks for support.

Question 7

When using a wireless systems,you are limited in how often you can use the same frequency band for different communications because the signals are not constrained and can interfere with each other even when separated geographically.

Question 8

Which of the following is NOT one of the components of the WAP specification?

A)A framework for wireless telephony applications
B)A full-featured communications protocol stack
C)A programming model based on the WWW
D)A markup language adhering to XML
E)A specification of a small browser

Question 9

When a mobile unit moves,it may connect with a different base station.This action is called

A)a handoff.
B)a transfer.
C)a reconfiguration.
D)a dropped signal.
E)an intertower pickup.

Question 10

The Wireless Application Protocol (WAP)is

A)proprietary protocol developed in the USA for wireless security.
B)dependent on the specific network technologies employed.
C)an Internet standard that replaces HTML,HTTP,and XML.
D)designed to overcome many of the limitations hindering acceptance of mobile data services.
E)used primarily with mobile paging systems.

Question 11

Wireless networks compete effectively in terms of data transfer rates when compared with wired networks.

Question 12

The specific base station that communicates with the mobile unit is selected by the MTSO based on the strength of the signal received from the mobile unit.

Question 13

Each mobile telecommunications switch office is connected to one base station and provides a management interface between that base station and the rest of the network.

Question 14

Wireless networks are more susceptible than wired networks to interference,signal loss,noise,and eavesdropping.

Question 15

When using cellular networks,

A)a single base station can serve multiple cells.
B)adjacent cells must use the same frequencies.
C)adjacent cells are assigned different frequencies.
D)non-adjacent cells are assigned different frequencies.
E)non-adjacent cells can use any frequency.

Question 16

The objective of the third generation of wireless communication is to provide high speed wireless communications to support multimedia,data,and video,in addition to voice.

Question 17

The WAP Programming Model uses a ________ that acts as a proxy server for the wireless domain.

A)translator
B)WAP server
C)decoder
D)compressor
E)gateway

Question 18

The ideal design for cells in a cellular network is a hexagonal shape because

A)this makes enforcement of shapes easier.
B)this is the easiest to implement.
C)this makes all frequencies available to all cells.
D)makes the distance to all adjacent cells the same.
E)all cells can be isolated.

Question 19

The idea of universal personal telecommunications refers to the capability of using one's terminal in a wide variety of environments to connect to information services.

Question 20

When using wireless networks,there are limitations on which frequencies can be used for the channels.

Question 21

The two alternative satellite schemes to GEO are

A)WAP and MEO
B)LEO and MEO
C)LEO and WAP
D)VSAT and WAP
E)VSAT and DBS

Question 22

Which of the following is a problem when using Geostationary Earth Orbit (GEO)satellites?

A)Tracking of the satellite position requires a computerized control system.
B)Large portions of the earth are out of reach of the systems.
C)The Doppler effect causes problems.
D)Because of distance,there are significant time delays in transmission times.
E)Only a few satellites can be position in orbit at any one time.

Question 23

Satellite communications is comparable in importance to optical fiber in the evolution of telecommunications and data communications.