Final Term Exams

Question No: 1    ( Marks: 1 )    - Please choose one

Which one best describes the given statement:

 

"To allow multiple users to share total capacity of a transmission medium"

► congestion control

► exchange management

► multiplexing

Question No: 2    ( Marks: 1 )    - Please choose one

Transmitting passwords is the responsibility of

► communication service module

► network access module

► file transfer application

 

Question No: 3    ( Marks: 1 )    - Please choose one

Line configuration refers to the way two or more devices attach to a ______.

► Link

► Circuit

► Route

► Node

Question No: 4    ( Marks: 1 )    - Please choose one

Secondary hub in a tree must be a passive hub.

► True

► False

Question No: 5    ( Marks: 1 )    - Please choose one

In mesh topology, if there are five nodes then there will be  _______ links.

► 5

► 10

► 15

► 20

Question No: 6    ( Marks: 1 )    - Please choose one

Line configuration is the function of ____________ layer

 

► data link

► network

► physical

► transport

Question No: 7    ( Marks: 1 )    - Please choose one

Data link layer deals with mechanical and electrical specifications of transmission medium and interface

► True

► False

Question No: 8    ( Marks: 1 )    - Please choose one

Session layer is responsible for segmentation and reassembly.

► True

► False

Question No: 9    ( Marks: 1 )    - Please choose one

A signal that repeats a pattern over a regular interval of time is called_______.

► periodic signal

► analog signal

► composite signal

Question No: 10    ( Marks: 1 )    - Please choose one

Signal can be controlled by three attributes: Amplitude, frequency and _______.

► phase

► time

► wavelength

Question No: 11    ( Marks: 1 )    - Please choose one

Frequency band in which 99% of the total power resides is called_______

► power bandwidth

► half power bandwidth

► 3dB bandwidth

► F.M.

Question No: 12    ( Marks: 1 )    - Please choose one

The amplitude of a digital signal depends upon the________ to represent a bit.

► phase

► voltage

► wavelength

Question No: 13    ( Marks: 1 )    - Please choose one

DC component is also termed as Direct current component or a component with non-zero frequency.

► False

► True

Question No: 14    ( Marks: 1 )    - Please choose one

The last process in PCM is _________ digital data into digital signal.

 

► encoding

► decoding

► modulating

Question No: 15    ( Marks: 1 )    - Please choose one

The powerful carrier signal is called as the___________

► carrier frequency

► base signal

► carrier frequency and base signal

► none of given

Question No: 16    ( Marks: 1 )    - Please choose one

In 8QAM each signal shift or one baud represents ______.

► 4 bits

► 2 bits

► 5 bits

► 3 bits

Question No: 17    ( Marks: 1 )    - Please choose one

Which of the following is most affected by noise?  ASK(options are not shown)

► 

► 

► 

► 

Question No: 18    ( Marks: 1 )    - Please choose one

Modulation of an analog signal can be accomplished through changing the ___________ of the carrier signal.

► amplitude

► frequency

► phase

► all of the given

Question No: 19    ( Marks: 1 )    - Please choose one

In ____________ transmission the timing of the signal is unimportant.

► Asynchronous

► Synchronous

► Polar

► Bi-polar

Question No: 20    ( Marks: 1 )    - Please choose one

In _____________ transmission, bits are transmitted simultaneously, each across its own wire.

► Asynchronous serial

► Synchronous serial

► Parallel

► Asynchronous & Synchronous serial

Question No: 21    ( Marks: 1 )    - Please choose one

In _____________ transmission, bits are transmitted over a single wire, one at a time.

► Asynchronous serial

► Synchronous serial

► Parallel

► Asynchronous & Synchronous serial

Question No: 22    ( Marks: 1 )    - Please choose one

In _____________ transmission, a start bit and a stop bit frame a character byte.

► Asynchronous serial

► Synchronous serial

► Parallel

► Asynchronous & Synchronous serial

Question No: 23    ( Marks: 1 )    - Please choose one

A ______________ converts an analog signal into a digital signal.

► Demodulator

► Modulator

► Digital-to-analog converter

Question No: 24    ( Marks: 1 )    - Please choose one

_________ requires more bandwidth.

► FSK

► ASK

► PSK

► QAM

Question No: 25    ( Marks: 3 )

Why we need a Null Modem?

 

Question No: 26    ( Marks: 5 )

Describe different types of NRZ encoding scheme?

 

Question No: 27    ( Marks: 10 )

Describe functions of each layer of  OSI Model briefly?