Computer Networks

Data Communication & Network Security Network Fundamentals Protocols Reference Models

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Computer Networks - Data Communication & Network Security

11:

Method of communication in which transmission takes place in both directions, but only in one direction at a time, is called

A.	simplex
B.	four wire circuit
C.	full duplex
D.	half duplex
	Answer Report Discuss
	Option: D Explanation : A half-duplex (HDX) system provides communication in both directions, but only one direction at a time (not simultaneously). Typically, once a party begins receiving a signal, it must wait for the transmitter to stop transmitting, before replying (antennas are of trans-receiver type in these devices, so as to transmit and receive the signal as well). A full-duplex (FDX), or sometimes double-duplex system, allows communication in both directions, and, unlike half-duplex, allows this to happen simultaneously. Land-line telephone networks are full-duplex, since they allow both callers to speak and be heard at the same time, the transition from four to two wires being achieved by a hybrid coil. A good analogy for a full-duplex system would be a two-lane road with one lane for each direction. For further Reference Click Here Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

12:

Unmodulated signal coming from a transmitter is known as

A.	carrier signal
B.	baseband signal
C.	primary singal
D.	None of these
	Answer Report Discuss
	Option: B Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

13:

Bit stuffing refers to

A.	inserting a '0' in user stream to differentiate it with a lag
B.	inserting a '0' in lag stream to avoid ambiguity
C.	appending a nibble to the lag sequence
D.	appending a nibble to the use data stream
	Answer Report Discuss
	Option: A Explanation : Bit stuffing is required when there is a flag of bits to represent one of the incidents like start of frame, end of frame, etc, If same lag of bits appear in the data stream, a zero can be inserted. The receiver deletes this zero from the data stream. Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

14:

In a broad sense, a railway track is an example of

A.	simplex
B.	half-duplex
C.	full-duplex
D.	All of these
	Answer Report Discuss
	Option: B Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

15:

Frequency range at which the land coaxial cables are used, is

A.	106 to 108 Hz
B.	1010 to 1011 Hz
C.	103 to 104 Hz
D.	None of these
	Answer Report Discuss
	Option: A Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

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