Deck 17: Wireless Lans

Question 1

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.

Answer 1

False

Question 2

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

Answer 2

C

Question 3

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

Answer 3

True

Question 4

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 5

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)this makes the distance to all adjacent cells the same

Question 6

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

Question 7

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

Question 8

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

Question 9

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

Question 10

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)cell division multiple access

Question 11

In 4G networks,IP telephony is the norm as are IP packet- switched connections for Internet access.

Question 12

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

Question 13

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.

Question 14

4G networks,devices,and services are expected to evolve slowly over the next decade.

Question 15

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 16

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

Question 17

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 18

In contrast to earlier generations,4G systems do not support traditional circuit-switched telephony service.

Question 19

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

Question 20

When using 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 21

As mobile units move,they pass from cell to cell,which requires transferring of the call from one base transceiver to another; this process is called a __________ .

Question 22

For a given system,multiple access is based on _______.

A)TDMA
B)FDMA
C)CDMA
D)all of the above

Question 23

A primary multiple access scheme used in cellular telephony is __________.

A)FDMA
B)TDMA
C)CDMA
D)all of the above

Question 24

As cells become smaller,antennas move from the tops of tall buildings or hills,to the tops of small buildings or the sides of large buildings,and finally to lamp posts,where they form ___________.

Question 25

The ____________ is a universal,open standard developed by the WAP Forum to provide mobile users to access telephony and information services including the Internet and the Web.

Question 26

The two types of channels that are available between the mobile unit and the base station are control and ___________.

Question 27

Peak download rate for a 4G network is __________.

A)1 Gbps
B)100 Mbps
C)500 Mbps
D)384 kbps

Question 28

Wireless communications is likely to be viewed as an essential part of an enterprise network infrastructure when:

A)Mobile communication is needed
B)Communication must take place in a hostile or difficult terrain that makes wired communication difficult or impossible
C)Communication facilities must be installed at low initial cost
D)The same information must be broadcast to many locations

Question 29

A __________ is a mobile device that mobile workers can use as a personal information manager.

Question 30

_________ was developed to address the limitations of cellular and other wireless networks for providing data services to mobile devices.

A)WAP
B)Droid
C)GEOS
D)WML

Question 31

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

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

Question 32

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

Question 33

A widely used first-generation system was the ______________,which was widely used in North and South America,Australia,and China through the 1980s and into the 2000s.

Question 34

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

Question 35

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

Question 36

The antenna systems on or near the earth are referred to as earth _________ .

Question 37

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

Question 38

There are basically four ways to divide the spectrum among active users: frequency division multiple access (FDMA),time division multiple access (TDMA),code division multiple access (CDMA),and ______________.

Question 39

Peak download rate for a 3G network is _________.

A)1 Gbps
B)100 Mbps
C)500 Mbps
D)384 kbps

Question 40

With ____________,a cell is divided into a number of wedge shaped sectors,each with its own set of channels,typically three or six sectors per cell.

Question 41

The electronics in the satellite that takes an uplink signal and converts it to a downlink signal is called a _________ .

Question 42

___________ have the following characteristics: • Circular orbit at an altitude in the range of 5000-12,000 km. • The orbit period is about 6 hours. • The diameter of coverage is from 10,000 to 15,000 km. • Round-trip signal propagation delay is less than 50 ms. • The maximum time that the satellite is visible from a fixed point on earth (above the radio horizon)is a few hours.

Question 43

A transmission from an earth station to the satellite is referred to as __________.

Question 44

Transmissions from the satellite to the earth station are __________.

Question 45

The most common type of communications satellite today is the _________,first proposed by the science-fiction author Arthur C.Clarke in 1945.