Code No: 155AV R18
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
B. Tech III Year I Semester Examinations, February - 2022
DATA COMMUNICATIONS AND NETWORKS
(Electronics and Communication Engineering)
Time: 3 hours Max. Marks: 75
Answer any five questions
us
All questions carry equal marks
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1. During the communication, how the various layers exchange information in OSI
Model. Describe with the help of suitable diagram. [15]
2. Explain the TCP/IP architecture. Show the comparison with the OSI model with the
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help of schematic diagram. [15]
3. Consider a message D, presented by the following polynomial x 19 +x17 + x16 +x13 +x12
+ x11 + x9 + x5 + x2 + 1, which is transmitted using the standard Cyclic Redundancy
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Check (CRC) method. The generator polynomial is x7 + x5 + x4 + x3 + x 2 + 1. Find the
CRC and show the actual bit string to be transmitted. [15]
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4.a) Differentiate between Pure ALOHA and slotted ALOHA protocol.
b) In a digital system with 8 input links are multiplexed using STDM. Each input source is
creating 1024 bits per second. Each frame contains 8 bits from each source and adds 1
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bit as a framing bit. Compute the number of frame transmitted per second and the data
capacity of the link. [7+8]
-2
5.a) Explain the network service model with a neat sketch.
b) Explain the format of IPV4 addressing. [8+7]
2
6. Illustrate in detail about the concept of forwarding and addressing in the internet. [15]
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7.a) Discuss about the Round-Trip Time Estimation and Timeout.
b) Why does UDP exist? Would it not have been enough to just let user processes send
raw IP packets? Justify answer. [8+7]
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8. Explain the Transport Services Available to Applications. [15]
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R18
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Code No: 155AV
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
SE
B. Tech III Year I Semester Examinations, March - 2021
DATA COMMUNICATIONS AND NETWORKS
(Electronics and Communication Engineering)
Time: 3 Hours Max. Marks: 75
D
Answer any five questions
All questions carry equal marks
---
1P2A
1.a) How does information get passed from one layer to the next in the Internet model?
Explain.
b) Illustrate how CDMA works in wireless LAN. [7+8]
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2.a) What is Cyclic Code? Explain the CRC error detection technique.
b) Give a detail note on the Random Access protocols. [8+7]
3E-R
3.a) Explain the functionality of ICMP protocol.
20
b) What is the format of IPv4 header? Describe the significance of each field. [7+8]
4.a) Describe why an application developer might choose to run an application over UDP
M2
rather than TCP.
b) Demonstrate three way handshake connection establishment in TCP. [7+8]
A1 R
5.a) Is an application’s architecture different from the network architecture? Defend your
answer.
ACM
b) What is DNS? Explain how DNS works. [8+7]
6.a) Explain the categories of networks.
b) Demonstrate Go Back-N sliding window Protocol with an example. [7+8]
H
7.a) Explain IEEE 802.11 standard for Ethernet with the help of frame format.
-2
b) Differentiate between pure ALOHA and slotted ALOHA. [8+7]
8. Write a short note on:
02
a) SMTP
b) HTTP. [8+7]
1
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Code No: 155AV R18
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
B. Tech III Year I Semester Examinations, September - 2021
DATA COMMUNICATIONS AND NETWORKS
U
(Electronics and Communication Engineering)
Time: 3 Hours Max. Marks: 75
SE
Answer any five questions
All questions carry equal marks
---
D
1.a) Draw and explain the OSI architecture.
b) Draw and explain the 802.11 architecture. [8+7]
2.a) How to convert a digital signal to analog? Explain with the help of an example.
PA
b) What is meant by Transmission media? Explain the types with a neat diagram for each.
[7+8]
3.a) Explain the functioning of FDMA.
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b) What are the advantages and disadvantages of Slotted ALOHA? [9+6]
4.a) Calculate and verify the efficiency of Pure ALOHA.
b) What is a collision? How can a collision be detected? Explain about CSMA/ CD. [7+8]
R
5.a) Explain the frame format of ICMP.
SS
b) Differentiate between static routing and dynamic routing. [8+7]
6.a) Imagine, multiple requests are raised from various clients. How can these requests be
handled? Explain in detail.
EP
b) Differentiate between VC network and Datagram Network. [8+7]
7.a) Explain how flow control and buffering would be handled by transport layer.
b) Explain the functioning of RPC. [8+7]
-2
8.a) Draw and explain the steps in looking up a URL when a CDN is used.
b) Draw and explain about the WAP protocol stack. [7+8]
02
1
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