NIELIT A Level Solved Paper July-2012

July, 2012

A9-R4: DATA COMMUNICATION AND 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 In TCP/IP, Packets may arrive out of sequence (they may have been routed differently, or
one may have been dropped), so the ________ in each packets allow TCP to reassemble
the packets in the correct order and to request retransmission of any missing packets
A) Sequence numbers
B) Port numbers
C) Source_id number
D) Reassembling of the packets in the correct order is not permitted
1.2 UDP is a fast, unreliable protocol and unreliable means there is
A) No sequencing
B) No guaranteed delivery
C) No automatic retransmission of lost packets
D) All of the above

NIELIT A Level Solved Paper January-2012

January, 2012

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 “tear-off” answer sheet attached to the question paper, following instructions therein. (1x10)
1.1 A protocol is a set of rules governing a time sequence of events that must take place
A) between an interface
B) between modems
C) between peers
D) across an interface
1.2 Which of the following communications lines is best suited for interactive processing of
applications?
A) full duplex lines
B) narrow band channel
C) simplex lines
D) mixed band channels

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