MCA-19
June Examination 2016
MCA IIIrd year Examination
Data Communication and Computer Networks
Paper MCA-19
Time 3 Hours Max. Marks 80
Note: The question paper is divided into three sections B and C. Write answers as per given instructions.
Section A 8 × 2 16
(Very Short Answer Questions)
Note: Answer all questions. As per the nature of the question delimit your answer in one word, one sentence or maximum upto 30 words. Each question carries 2 marks.
Name the various types of topologies used for connecting PCs.
Give the definition of Protocol.
What is Latency?
According to Nyquist the theoretical maximum bit rate can be calculated by the formulae
What is framing in the Data link layer?
State count to infinity problem.
807
MCA-19 100 3 (P.T.O.)
MCA-19 100 3 (Contd.)
807
Name two application layer Protocols.
(viii) What is need of modulation?
Section B 4 × 8 32
(Short Answer Questions)
Note: Answer any four questions. Each answer should not
exceed 200 words. Each question carries 8 marks.
Name the three types of transmission modes. Explain with
suitable example each mode of transmission.
What do you mean by multiplexing? Compare Frequency
division Multiplexing and Time division Multiplexing.
What do you mean by Routing? Explain the different fields of
an IPv4 packet.
Discuss the role of transport layer in OSI model.
Discuss the working of DNS (Domain name system). Also
explain its significance.
What is meant by a switched network? Why do you prefer it
over point-to-point network?
What is the purpose of placing twists in a pair of wires used
in a twisted pair as transmission medium? Why do we earth
the shield of a coaxial cable?
Explain the concept of the Simple Mail Transfer Protocol
giving suitable examples.
MCA-19 100 3
807
Section C 2 × 16 32
(Long Answer Questions)
Note: Answer any two questions. You have to delimit your each
answer maximum upto 500 words. Each question carries
16 marks.
10) What are the design issues of layered architecture? Compare
and contrast the OSI 7-layer model with TCP/IP model.
11) What is the use of sliding window? Compare UDP and TCP.
12) What is flow control in the data-link layer? What are the
available flow control techniques?
13) Write short note on the following:
Selective Repeat ARQ.
HDLC Protocol.