Download VTU BE 2020 Jan CSE Question Paper 15 Scheme 4th Sem 15CS46 Data Communication

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15CS46
Fourth Semester B.E. Degree Examination, Dee.20191Jan.2020

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Data Communication
Time: 3 hrs.
Max. Marks: 80
4; Note: Answer any FIVE full questions, choosing ONE full question front each module.
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Module-1
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1 a. What in data communication? Explain data flow techniques of data communication.
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(05 Marks)
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Explain the functionalities of OSI reference model layers. (07 Marks)
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What is physical and logical addresses in TCP/IP reference model. (04 Marks)
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2 a. Explain period, frequency and phase of an periodic analog signal. For the given signal (sine
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wave) with offset 1/6 cycle with respect to time(0), find the phase of the signal, express
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phase in terms of degree and radiance. (05 Marks)
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b. What are the causes for transmission impairments during signal transmission through
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(05 Marks)
c. Draw line code for the sequence 010011001 using NRZ, Bipolar, Manchester and
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differential Manchester. (06 Marks)
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3 a. Explain process-sampling with respect to PCM (Pwse code modulation)? Explain different

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types of sampling methods. (05 Marks)

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b. What is parallel and serial data transmission? Explain the three ways, how the serial

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a - c. An analog signal with bit rate. 6000 bps and baud rate 1000 baud, find how many data
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-1. 8.

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elements are carried by each signal element? Also find how many signal elements are
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required.
d?

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(06 Marks)
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OR
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4 a. Explain the mechanisms for modulating digital data into analog signal (Data).
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(08 Marks)
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b. Define multiplexing and de-multiplexing. With the diagram explain the Frequency Division.
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Multiplexing (FDM) technique. (08 Marks)
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6

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5 a. Find the code word for the following using CRC. Given information polynomial
.,,
t i(x) = x' + x
3

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and genera tor polynomial g(x) = x
3
+ x + 1. (06 Marks)
N

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b. Explain the working of any two protocols of noisy channels. (10 Marks)
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t
0 6 a. Explain frame types of HDLC. (05 Marks)
b. Explain PPP protocol frame format, with the diagram. Also mention the different transition
phases of PPP. (08 Marks)
c. What is framing in data lank layer, explain different techniques to identify frame boundaries.

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(03 Marks)
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\ .S1
15CS46
Fourth Semester B.E. Degree Examination, Dee.20191Jan.2020
Data Communication
Time: 3 hrs.

--- Content provided by⁠ FirstRanker.com ---

Max. Marks: 80
4; Note: Answer any FIVE full questions, choosing ONE full question front each module.
0
U
L

--- Content provided by⁠ FirstRanker.com ---

.
-
7:,
Module-1
P

--- Content provided by⁠ FirstRanker.com ---

c 1
1 a. What in data communication? Explain data flow techniques of data communication.
-0
(05 Marks)
ct

--- Content provided by FirstRanker.com ---

_ .) b.
Explain the functionalities of OSI reference model layers. (07 Marks)
,,i
0)
.0

--- Content provided by​ FirstRanker.com ---

to
c.
What is physical and logical addresses in TCP/IP reference model. (04 Marks)
CZ =

--- Content provided by‌ FirstRanker.com ---

C. ? ?-.
Y ..
\ -- C
.
Ca C)

--- Content provided by⁠ FirstRanker.com ---

OR
53
in
to
oc

--- Content provided by​ FirstRanker.com ---

2 a. Explain period, frequency and phase of an periodic analog signal. For the given signal (sine
ii
.
+
_

--- Content provided by​ FirstRanker.com ---

0 ,
wave) with offset 1/6 cycle with respect to time(0), find the phase of the signal, express
._
cz <,-
0

--- Content provided by‍ FirstRanker.com ---

phase in terms of degree and radiance. (05 Marks)
L.
1)
41
b. What are the causes for transmission impairments during signal transmission through

--- Content provided by​ FirstRanker.com ---

u
- - channel?
.-
0
(05 Marks)

--- Content provided by⁠ FirstRanker.com ---

c. Draw line code for the sequence 010011001 using NRZ, Bipolar, Manchester and
?.).
... 5
differential Manchester. (06 Marks)
U

--- Content provided by‌ FirstRanker.com ---

3. =
0 Module-2
,.
as
ti)

--- Content provided by‌ FirstRanker.com ---

-0
C
3 a. Explain process-sampling with respect to PCM (Pwse code modulation)? Explain different
,T3 .
,

--- Content provided by⁠ FirstRanker.com ---

E, -
0
types of sampling methods. (05 Marks)
Ps '
-

--- Content provided by‌ FirstRanker.com ---

`;
5
b. What is parallel and serial data transmission? Explain the three ways, how the serial
-0
>, t transmission is achieved. (05 Marks)

--- Content provided by‍ FirstRanker.com ---

:-.
0

a - c. An analog signal with bit rate. 6000 bps and baud rate 1000 baud, find how many data
.. ,, ?

--- Content provided by FirstRanker.com ---

a

-1. 8.
elements are carried by each signal element? Also find how many signal elements are
. 0.

--- Content provided by​ FirstRanker.com ---

.--,6 a,
required.
d?
(06 Marks)
F

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. -9
)
,, :'
OR
c

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cc:
4 a. Explain the mechanisms for modulating digital data into analog signal (Data).
i_. 0
(08 Marks)
7-. '

--- Content provided by‍ FirstRanker.com ---

b. Define multiplexing and de-multiplexing. With the diagram explain the Frequency Division.
,-
0
tm
0 t.0

--- Content provided by⁠ FirstRanker.com ---

Multiplexing (FDM) technique. (08 Marks)
? c
1'.
a
P > Module-3

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E.)

6
>,
5 a. Find the code word for the following using CRC. Given information polynomial

--- Content provided by FirstRanker.com ---

.,,
t i(x) = x' + x
3
and genera tor polynomial g(x) = x
3

--- Content provided by‍ FirstRanker.com ---

+ x + 1. (06 Marks)
N

b. Explain the working of any two protocols of noisy channels. (10 Marks)
o

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Z
*E' OR
cz
t
0 6 a. Explain frame types of HDLC. (05 Marks)

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b. Explain PPP protocol frame format, with the diagram. Also mention the different transition
phases of PPP. (08 Marks)
c. What is framing in data lank layer, explain different techniques to identify frame boundaries.
(03 Marks)
1 of 2

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15CS46
Module-4
7 a. What are ALOHA protocols? Explain its different types with respect to channel multiple
accesses. (06 Marks)
b. Explain channelization protocols for multiple access with diagram. (10 Marks)

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OR
8 a. What is persistence methods? Explain the behavior of pernistance methods with diagram.
(06 Marks)
b. What is hidden and exposed station problem? Explain with the diagram. (05 Marks)
C. What is Piconets and Scatternets? Explain the working with the diagram. (05 Marks)

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Module-5
9 a. Write a note on IPV6 header format. (10 Marks)
b. Explain mobile IP with phases. (06 Marks)
OR
10 a. What is routing of packets? With respect to data communication. Explain intra domain and

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inter domain routing techniques. (10 Marks)
b. Write a note on multicast routing protocols. (06 Marks)
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