NIELIT A Level Solved Paper July-2014

 July, 2014

A9-R4: DATA COMMUNICATION AND NETWORK TECHNOLOGIES

PART ONE

(Answer all the questions)

1. Each question below gives a multiple choice of answers. Choose the most appropriate one and enter in the “OMR” answer sheet supplied with the question paper, following instructions therein. (1x10)
1.1 Which of the following statement is NOT true with respect to Differential Phase Shift Keying
(DPSK)?
A) DPSK has the advantage of reduced receiver complexity
B) Energy efficiency of DPSK is inferior to that of coherent PSK by about 3 dB
C) DPSK is a general type of phase modulation that conveys data by changing the phase of the
carrier wave
D) DPSK is a coherent form of phase shift keying which needs a coherent reference signal at
the receiver
1.2 Wave Division Multiplexing (WDM) is an analog multiplexing technique to combine
________ signals.
A) Optical
B) Audio
C) Video
D) Noise

NIELIT A Level Solved Paper January-2014

 January, 2014

A9-R4: DATA COMMUNICATION & NETWORK TECHNOLOGIES

PART ONE

(Answer all the questions)

1. Each question below gives a multiple choice of answers. Choose the most appropriate one and enter in the “OMR” answer sheet supplied with the question paper, following instructions therein. (1x10)

1.1 Class A network with address 10.0.0.0 with 40 subnets is required to add 60 new subnets very
soon. Which subnet mask should be assigned to network?
A) 255.240.0.0
B) 255.248.0.0
C) 255.252.0.0
D) 255.254.0.0
1.2 Which of the following is done in the physical layer of the ATM network?
A) Monitoring of the user information field for bit errors and possible corrective actions
B) Transmission frame generation/recovery
C) Generic flow control
D) Cell multiplexing and demultiplexing

NIELIT A Level Solved Paper July-2013

July, 2013

A9-R4: DATA COMMUNICATIONS AND NETWORK TECHNOLOGIES

PART ONE

(Answer all the questions)

1. Each question below gives a multiple choice of answers. Choose the most appropriate one and enter in the “OMR” answer sheet supplied with the question paper, following instructions therein. (1x10)

1.1 Performance of a network can be measured by considering ________.
A) transit time
B) response time
C) both A) and B)
C) none of the above
1.2 The term ________ refers to the way in which a network is laid out physically.
A) physical topology
B) conceptual structure
C) network design
D) none of the above

NIELIT A Level Solved Paper Jan-13

January, 2013

A9-R4: DATA COMMUNICATION & NETWORKS TECHNOLOGIES

PART ONE

(Answer all the questions)

1. Each question below gives a multiple choice of answers. Choose the most appropriate one and enter in the “tear-off” answer sheet attached to the question paper, following instructions therein. (1x10)

1.1 Interleaved digital signals from n devices forming frame of data take place in
A) FDM
B) TDM
C) WDM
D) None of the above
1.2 Upper support layers - session, presentation and application of OSI model are almost
invariably implemented in
A) Hardware (only)
B) Software (only)
C) Hardware and Software both
D) None of the above