Data Communication Question Paper

1. 1
SET A
Roll No. Total No. of Pages 02
WALCHAND INSTITUTE OF TECHNOLOGY, SOLAPUR
Electronics and Telecommunication Engineering, Odd Semester, 2023-24
In Semester Examination Test –I
Course: ET412: Data Communication
Class: Final Year B.Tech. E&TC Semester: VII Maximum Marks: 30
Date: 24 /09/2023 Time: 60 min
Instructions:
1. All the questions are compulsory.
2. Please write down the Serial Number of the question before attempting it.
3. Consider the proper data wherever needed.
Que
No.
Sub
Que.
Marks
CO
Mapping
Q.No.1. Choose the correct option 6 CO2
(i)
(ii)
(iii)
(iv)
In which network topology is each device connected to a
central hub or switch?
a) Bus b) Star c) Ring d) Mesh
Which layer of the OSI model is responsible for routing and
forwarding data packets?
a) Physical layer b) Data Link layer
c) Network layer d) Transport layer
Which network device operates at the Data Link layer of
the OSI model and filters traffic based on MAC addresses?
a) Switch b) Router
c) Repeater d) Gateway
Which error detection method uses a generator polynomial
for computation?
a) Block Parity Code b) CRC Code
c) Hamming Code d) Checksum
6

2. 2
(v)
(vi)
Which switching method is more suitable for voice and
video calls due to its dedicated path?
a) Packet Switching b) Circuit Switching
c) Frame Switching d) Cell Switching
Which flow control method allows the sender to send
frames continuously without waiting for acknowledgments
but uses a window size to control the number of
unacknowledged frames?
a) Stop and Wait Protocol b) Sliding Window Protocol
c) Piggybacking d) Token Ring
Q.No.2. Answer the questions 10 CO4
a
b
You are tasked with designing a network for a small office
with ten employees. The office requires reliable
communication, low latency, and ease of management. The
budget is limited, and the office space is compact. Which
network topology would be the most suitable choice for this
scenario, and why?
Options:
A) Star Topology
B) Mesh Topology
C) Bus Topology
D) Ring Topology
Draw a detailed diagram illustrating the seven layers of the
OSI model. Describe the key responsibilities of each OSI
layer and provide an example of a protocol associated with
Network and Transport Layer.
Q.No.3. Attempt any two. 14 CO2
a
b
c
You are implementing a data link layer protocol using the
bit stuffing framing approach. The start and end of a frame
are defined by a special bit sequence '01111110'
(hexadecimal: 0x7E). Explain how bit stuffing and
destuffing works with a example data
"10101110111110100101111010111110"
Given the dataword 101001111 and the divisor 10111,
show the generation of the CRC codeword at the sender
side.
For the 4 bit data 3 parity bits are added by the sender to If
the 7-bit hamming code word received by a receiver is
1011011.Assume the even parity state whether the received
code is correct or wrong. If wrong locate the bit having
error.