Data Communication and Computer Network.pdf - Google Drive
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Data Communication and Computer Network.pdf - Google Drive
(a) RS -232 C (b) RS - 423. (c) RS - 449 (d) RS - 422. State True/False for (Q. 6 to 10) : 6. Eaves dropping is not poss
No. of Printed Pages : 4
CST-202 I
ADIT/BIT PROGRAMME O
00 O O
Term-End Examination December, 2011
CST-202 : DATA COMMUNICATION AND COMPUTER NETWORKING Time : 3 hours Note :
Maximum Marks : 75
All questions from section A are Compulsory. Answer any three from section B. All questions (1 to 10) carry one mark each.
SECTION - A Select the best alternative (Q. 1 to 5) 1. Which transmission is having highest efficiency ? (a) Simplex (b) Half Duplex (c) Full Duplex (d) Automatic
2. Digitalization refers to (a) (b)
Sampling only
(c) (d)
Quantization only
Either Sampling or quantization Both sampling and quantization
3. Sliding window protocol is a protocol. (a) Service (b) Flow (c) Logic (d) Error
CST-202
1
control
P.T.O.
4.
X.25 normally assumes the use of as the physical level standard. (a) X . 21 (b) ISDN (c) IEEE 802.1 (d) FDDI
5.
Which one of the following is a balanced
interface ? (a) RS -232 C (b) RS - 423 (c) RS - 449 (d) RS - 422 State True/False for (Q. 6 to 10) : 6.
Eaves dropping is not possible in coaxial cables.
7.
If central node in star topology fails, whole network fails.
8.
Media access control in FDDI is based on packet passing.
9.
The preamble field of the IEEE 802.3 frame contains 12 bits.
10.
IEEE 802.4 standard defines a DQDB network.
CST-202
2
11.
(a) Write any three differences between each 3x5=15 of the following : (i) ASK and PSK DQDB and X.25 (iii) Fibre optics and UTP (iv) Token Ring and Token Bus (v) Internet and Intranet (b) List the address range of different classes of 5 IP addresses (Class A to Class D). Also, explain the importance of subnet masking.
CST-202
3
P.T.O.
SECTION - B Answer any three questions from the following :
12.
(a) What is the need of multiplexing in data communication ? Differentiate between upward and downward multiplexing.
(b) What is the motivation for Sub-Layers in
9
Data link layer ? Explain the contention based and polling based Media Access Protocols.
13.
(a) Draw the header of TCP. Explain the 9 purpose and use of each field in the protocol. (b) Compare and contrast LAN, MAN and 6 WAN. Also, give an example of each.
14.
(a) What is microwave transmission ? Write
5
two advantages and disadvantages each of the microwave system. (b)
What is MODEM ? List at least four 5 functions of MODEM.
