QUESTION 1

________ multiplexing is commonly used for multiplexing digitized voice streams and data streams.

		Time division
		Frequency division
		Statistical time division
		Synchronous time division

8 points

QUESTION 2

From the carrier's central office to the customer's site is ________.

		asymmetric
		upstream
		headend
		downstream

8 points

QUESTION 3

The ________ time is the time it takes for a bit to traverse the link between source and destination.

		relay
		flow
		transmission
		propagation

8 points

QUESTION 4

The time it takes for a station to emit all of the bits of a frame onto the medium is the ________ time.

		link
		relay
		propagation
		transmission

8 points

QUESTION 5

Frequency division multiplexing can be used with ________ signals.

		digital signals carrying digital data
		analog signals carrying digital data
		analog
		digital

8 points

QUESTION 6

Synchronous time division multiplexing can be used with ________ signals.

		analog
		digital signals or analog signals carrying digital data
		digital
		digital signals carrying digital data

8 points

QUESTION 7

The transmitted data in synchronous TDM are organized into ________.

		blocks
		frames
		channels
		frequencies

8 points

QUESTION 8

_______ provide the ARQ mechanism in HDLC when piggybacking is not used.

		I-frames
		R-frames
		U-frames
		S-frames

8 points

QUESTION 9

Over a data link, data are sent in blocks called ________.

		links
		units
		entities
		frames

8 points

QUESTION 10

The flag field pattern is ________.

		01111110
		01111010
		00111110
		01111101

8 points

QUESTION 11

The sending station must not send frames at a rate faster than the receiving stations can absorb them.

True

False

2 points

QUESTION 12

HDLC uses asynchronous transmission.

True

False

2 points

QUESTION 13

Large numbers of voice and data transmissions can be carried simultaneously using multiplexing.

True

False

2 points

QUESTION 14

In situations where the bit length of the link is greater than the frame length, serious inefficiencies result.

True

False

2 points

QUESTION 15

Synchronization and interfacing techniques are sufficient by themselves.

True

False

2 points

QUESTION 16

The beginning and end of each frame must be recognizable for effective communication between two directly connected transmitting-receiving stations.

True

False

2 points

QUESTION 17

An individual cable modem subscriber may experience access speeds from 500 kbps to 1.5 Mbps or more, depending on the network architecture and traffic load.

True

False

2 points

QUESTION 18

In TDD, data are transmitted in both directions at the same time.

True

False

2 points

QUESTION 19

The long distance carrier system provided in the US and throughout the world was designed to transmit voice signals over high capacity transmission links such as optical fiber, coaxial cable, and microwave.

True

False

2 points

QUESTION 20

Synchronous TDM is called synchronous because synchronous transmission is used.

True

False