Unformatted text preview: END TERM EXAMINATION
Exam Roll No, votes
Paper Code: MCA 207
THIRD SEMESTER [MCA] DECEMBER 2015
Time : 3 Hours
Subject, Data Communication & Networking
Maximum Marks 160
Note: Attempt any five questions including O. No. 1 which is compulsory.
Select one question from each unit.
Answer the following briefly:
Differentiate between a low pass filter and a band pass filter.
Explain different modes of transmission in an optical fiber.
Define QAM and draw the constellation diagram for 320AM.
Why do we need flow control?
Differentiate between ALOHA and Slotted ALOHA,
What is the channel allocation problem?
What is classful addressing?
What is the utility of NAT?
Describe a 3- way handshake.
What is public key encryption?
Q2. a) Explain multiplexing and its types with focus on its application in the
Mobile telephone system.
b) Differentiate between OSI and TCP/IP reference models in terms of
Q3. a) Describe different types of communication satellites.
b) Encode the following bits into a digital signal using bipolar AMI and
HDB3 encoding schemes: 1100100001 101.
Q4. a) What is a two dimensional parity check? Calculate the redundancy
bits for the following data using the Hamming code: 1100101011. (7)
b) Differentiate between Selective repeat and Go back N sliding window
Q5. a) How are collisions avoided in a wireless network?
b) Describe a collision free protocol.
c) Draw the structure of an Ethernet frame.
(6. a) Explain the IPV4 with the help of a datagram format.
bj Explain different types of ICMP messages.
MCA - 207...
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