Networking Chapter 6

Question 1

Which multiplexing technique is used for analog signals?

Answer 1

FDM

Question 2

Which multiplexing technique is used for digital signals?

Answer 2

TDM

Question 3

Which multiplexing technique shifts each signal to a different carrier frequency?

Answer 3

FDM

Question 4

Which multiplexing technique involves signals composed of light beams?

Answer 4

WDM

Question 5

________ is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.

Answer 5

Multiplexing

Question 6

____ is designed to use the high bandwidth capability of fiber-optic cable.

Answer 6

WDM

Question 7

______ is an analog multiplexing technique to combine optical signals.

Answer 7

WDM

Question 8

_____ is a digital process that allows several connections to share the high bandwidth of a link.

Answer 8

TDM

Question 9

We can divide ____ into two different schemes: synchronous or statistical.

Answer 9

TDM

Question 10

In ________ TDM, each input connection has an allotment in the output even if it is not sending data.

Answer 10

synchronous

Question 11

In ________ TDM, slots are dynamically allocated to improve bandwidth efficiency.

Answer 11

statistical

Question 12

The _______ technique uses M different carrier frequencies that are modulated by the source signal. At one moment, the sign modulates one carrier frequency; at the next moment, the signal modulates another carrier frequency.

Answer 12

FHSS

Question 13

The ______ technique expands the bandwidth of a signal by replacing each data bit with n bits using a spreading code.

Answer 13

DSSS

Question 14

Groups, super groups, master groups, and jumbo groups are terms used in ______________.

Answer 14

FDM

Question 15

Multilevel multiplexing is a strategy used in ___________.

Answer 15

TDM

Question 16

Multislot allocation is a strategy used in ___________.

Answer 16

TDM

Question 17

Pulse stuffing is a strategy used in ___________.

Answer 17

TDM

Question 18

Frame synchronization is a strategy used in ___________.

Answer 18

TDM

Question 19

A T-1 line uses ___________ frames.

Answer 19

8000

Question 20

We need addressing mechanism in ___________ TDM.

Answer 20

statistical

Question 21

What is TDM?

Answer 21

Time-division multiplexing; this occurs when you transmit and receive independent signals over a common path by using synchronized switches at each end, so that each signal appears on the line only for a fraction of a second.

Question 22

What is FDM?

Answer 22

Frequency-division multiplexing; this is where the bandwidth in a cable is divided among a series of non-overlapping frequency sub-bands, each of which is used for a separate signal.

Question 23

What is WDM?

Answer 23

Wavelength-division multiplexing; this is where a number of optical signals are carried on a single fibre, each occupying a different wavelength of light.

Question 24

What is DSSS?

Answer 24

Direct-sequence spread specturm; this is a modulation technique where the transmitted signal takes up more bandwidth than the information signal that modulates the carrier or broadcast frequency.

Question 25

What is FHSS?

Answer 25

Frequency-hopping spread spectrum; where the transmission of the signal is accomplished by jumping between many frequency channels at random.