DOEACC Society 2007 DOEACC A Level A9-R3 Data Communication and Networks - Question Paper

A9-R3: DATA COMMUNICATION AND NETWORK
NOTE:
1. There are 2 PARTS in this Module/Paper. PART 1 contains 4 ques.
and PART 2 contains 5 ques..
2. PART 1 is to be answered in the TEAR-OFF ans SHEET only, attached to
the ques. paper, as per the instructions contained therein. PART 1 is NOT to
be answered in the ans book.
3. Maximum time allotted for PART 1 is 1 HOUR. ans book for PART TWO
will be supplied at the table when the ans sheet for PART 1 is returned.
However, candidates, who complete PART 1 earlier than 1 hour, can collect the
ans book for PART 2 immediately after handing over the ans sheet for
PART ONE.
TOTAL TIME: three HOURS TOTAL MARKS: 100
(PART 1 – 40; PART 2 – 60)
PART ONE
(Answer all the questions)
1. every ques. beneath provide a multiple option of answers. select the most
improper 1 and enter in the “tear-off” ans sheet attached to the ques.
paper, subsequent instructions therein. (1 x 10)
1.1 Circuits board or card that is installed in a computer so that it can be connected to a
network:
A) Modem
B) NIC
C) Repeater
D) Router
1.2 Digital Channel means that the channel
A) is digitized
B) is carrying digital data
C) accepts digital modulation techniques
D) None of the above
1.3 Flow control in OSI model is done by
A) Data link layer
B) Network layer
C) Transport layer
D) Both data link and transport layer
1.4 Suppose you want to send an e-mail note to someone on the Internet. Which of these do
you NOT need?
A) browser
B) Internet service provider
C) at sign
D) address
A9-R3 Page one of five January, 2007
1.5 In TCP, the path
A) up to destination is allocated before the transmission of message starts
B) up to next intermediate node is allocated before the transmission of message starts
C) to be followed depends on the length of message
D) none of the above
1.6 IP address in the B class is?
A) 125.123.123.2
B) 191.023.21.54
C) 192.128.32.56
D) 10.14.12.34
1.7 Which of the subsequent to keep track of the individual units of data (called packets) that a
message is divided into for efficient routing through the Internet.
A) Address Resolution Protocol (ARP)
B) Internet Protocol (IP)
C) Hypertext Transfer Protocol (HTTP)
D) Transmission Control Protocol/Internet Protocol (TCP/IP)
1.8 How much channel throughput of slotted ALOHA will be in comparison to pure ALOHA.
A) identical
B) Double
C) 3 times
D) None of these
1.9 For separating channels in FDM, it is necessary to use
A) time slots
B) band pass filters
C) differentiation

Earning:   Approval pending.