DOEACC Society 2006 DOEACC B Level - B2.4 Data Communication and Computer Networks ( ) - Question Paper

B2.4-R3: DATA COMMUNICATION AND COMPUTER NETWORKS
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 Which 1 of the subsequent is a balanced interface?
A) RS-232C
B) RS-423C
C) RS-449
D) RS-422
1.2 A crossbar switch having n input lines and n output lines (i.e. n full duplex lines) has
subsequent number of intersections.
A) n
B) 2n
C) n2
D) 2n2
1.3 Video on demand, Live television, from many sources, full motion multimedia, electronic
mail is offered by
A) X.25
B) Frame Relay
C) N-ISDN
D) B-ISDN
1.4 The device operating at Data link layer is
A) Bridge
B) Router
C) Repeater
D) None of the above
B2.4-R3 Page one of five July, 2006
1.5 Flow control is the mechanism to regulate the flow of information, so that a fast host
cannot overrun a slow one. This is the function of the subsequent OSI Layer
A) All Layers
B) Physical Layer
C) Transport Layer
D) Application Layer
1.6 The T1 carrier corresponding to time division multiplexing consists of subsequent number
of voice channels
A) 24
B) 12
C) 20
D) 32
1.7 In Cellular Mobile Communication handoff means
A) to disturb the signal
B) to disturb the antenna
C) to switch to a new channel when call is in progress
D) to switch off the MTSO
1.8 GSM stands for
A) Good Service Management
B) Global Service Management
C) Good Sender Memory
D) Global System for Mobile Communications
1.9 Dual cable and signal cable are the 2 kinds of
A) Broadband networks
B) Baseband networks
C) Radio networks
D) Satellite networks
1.10 TELNET, FTP, SMTP, Protocols fall in the subsequent layer of OSI reference model
A) Transport Layer
B) Internet Layer

Earning:   Approval pending.