NIELIT A Level Solved Paper July-2011

July, 2011

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 “tear-off” answer sheet attached to the question paper, following instructions therein. (1x10)

1.1 In Quadrature Phase Shift Keying (QPSK) modulation
A) a cosine carrier is varied in phase while keeping a constant amplitude and frequency
B) a sine carrier is varied in phase while keeping a constant amplitude and frequency
C) a cosine carrier is varied in amplitude while keeping a constant phase and frequency
D) a sine carrier is varied in amplitude while keeping a constant phase and frequency

NIELIT A Level Solved Paper January-2011

January, 2011

A9-R4: DATA COMMUNICATION & NETWORKING 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 Which of the following technique uses four twisted-pair cables that connect each station to a

common hub?

A) 10Base-2

B) 10Base-5

C) 10Base-T

D) 10Base-F

NIELIT A Level Solved Paper July-10

A9-R4 : Data Communication Network Technologies (DCN)

July-10 Solved

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 What is true in case of CHAP?

A) It uses a three-way handshake

B) It encrypts the process using RC4

C) It repeats the challenge at random intervals

D) It is stronger than Kerberos

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