T" 3c1- A
0 โข C
Roll Number:
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Thapar Institute of Engineering & Technology, Patiala
Department of Computer Science and Engineering
EST Examination
B. E. (Third Year): Semester-V (2022-23) ODD
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Course Code: IJCS413
Branch: CSE/COE
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Course Name: Network Programming
13 Dec, 2022 (Tuesday)
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Time: 9:00 A.M.
Duration: 3 Hours
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Max Marks: 40
Name of Instructors: Dr.
Sunlit,
Dr.
Ashima, Dr.
Jayendra, Dr. Shashank
Note:
ALL questions are compulsory. Attempt ALL questions in a proper sequence. Questions
having multiple parts should be attempted at one place. Without proper steps and justification
(wherever required), no marks will be awarded. Write your programs in C. Assume missing
data, if any, suitably.
Q
Describe the prototype/syntax (return type and parameters) of the following functions:
selectยฐ, FD_SETO, FD_ISSETO, recyfrum(), scip_sendmsg0, setp_recimsg(), gelsockoptยฐ
7
Q2
Write a date-time TCP Server program that returns current date and time to the client. Take the
help of the below program for retrieving date.
[No
need to write client-side code and header
files]
#include<time.h>
int main(){
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time_t t;
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time(&t);
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char *s = ctime(&t);
printf("\nCurrent date and time is %s", s);
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return 0;
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}
Q3
Write a program to implement IP broadcast packet sending process using connectionless socket
programming. Take the class
B
network segment 172.16.x.x as an example, where the smallest
address 172.16.0.0 represents the network segment; and the largest address 172.16.255.255 is the
broadcast address in the network segment. When we send a data packet to this address, all hosts
on the network segment will receive and process it. Broadcast packets are sent and received
through UDP sockets.
[No
need to write the receiving process code and header
.
files].
The steps to be followed are as follows:
a)
Create a UDP socket;
b)
Fill the broadcast information structure;
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struct
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sockaddr_in
c)
Set socket options to allow broadcast packets to be sent;
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setsockupt(
d)
Send data packet;
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sendtoO
4
Q4
a)
Explain why we can only create 4094 VLANs on one physical network?
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(0.5 marks)
b)
Why TPID is kept as the first field in VLAN tag?
(0.5 marks)
c)
Explain how VLANs reduces Broadcast domain on one physical network.
(2 marks)
d)
Explain the statement "Stations do not belong to VLANs, but packets do".
(1 mark)
e)
Why do we require SVIs'? What limitations VLANs will face in absence of SVIs'? (I
mark)
I)
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Given following network topology in
Fig. I :
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(2 marks)
7
Consider
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following
๎
information:
Interface
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are
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and
1,(
P,.4
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P2, P I
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in VLAN10
interface
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P3
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is
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in
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VLAN20.
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The
Gateway IP addresses of VLAN 10
and
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VLAN20 are
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192.168.1.1
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and
These
,
PI
P4
192.168.2.1
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respectively.
177
p:
,โ,,,iโ,
Ph
H.,โโ,โ
I
Gateways are configured as SVIs at
Gateways
interface P7 of Router. The MAC
addresses of PC1, PC2, PC3 and P7
are MRI, MR2, MR3 and MR7
respectively.
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Suppose all
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the
๎
ARP
i.,
P5
requests
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are
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completed
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in
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this
PC3
p
scenario.
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Answer
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the
๎
following
question.
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Figure 1
