Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 6th Semester (Sixth Semester) 2015-2016 ECS 601NCS Computer Networks Question Paper
(Following Paper ID and Roll No. to be ?lled in your
Answer Books)
RollNol l] liTITIT
B.TECH.
Theory Examination (Semester-VI) 2015-16
COMPUTER NETWORKS
Time : 3 Hours Max. Marks : 100
Note: Attempt questions from all Sections as per directions.
Section-A
Attempt all parts of this section. Answer in brief.
(2X10=20)
Q1. (a) Given the IP address 180.25.21.172 and the subnet
mask 255.255.1920, what is the subnet address?
(b) What is count-to-in?nity problem?
- (c) The ?lters used in telephony end of?ces limit high fre-
quency components on telephone lines. What is its cut-
off ?equency when ADSL modems are used on cus?
tomer lines?
(1) P.T.O.
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(d)
(e)
(f)
(g)
(h)
(1)
(i)
Measurement of slotted ALOHA channel with in?nite
number of users show that the 10 percent of slots are
idle.
(1) What is the channel load?
(i1) What is the throughput?
What is the net mask of the gateway inter?tce in a sub-
network where maximum of 25 hosts exist and IP ad-
dress of one of the hosts is 192.168.].1?
A typical socket-server application responds user reqilests
using TCP over a speci?ed port. What is the typical
sequence in terms of socket ?mctions on server side?
How many layers are there in X.25 protocol? Enlist the
layers.
De?ne routing. In what way it is di??enent ?om switching?
What are the applications of Computer Networks?
Give an example of packet Meta data.
Section-B
2. Attempt any ?ve questions from this section. (lOXS=50)
(a) A rectangular wave-guide (a = 2 cm b = 1 cm) ?lled with de-
ionized water (p=l, ?= 81) operates at 3 GHz. Determine all
propagating modes and corresponding cut-off frequencies.
(2)
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(b)
(c)
(d)
(e).
(1) An ALOHA network uses 19.2 Kbps channel for send-
ing message packets of 100 bits long size. Calculate the
maximum throughput for pure ALOHA network.
(i1) What is unicast routing? Discuss unicast routing
protocols.
How does DNS perform data name resolution? What are the
different types of name servers? Mention the DNS message
format for query and reply messages.
Explain TCP congestion control algorithm in internet. What is
TCP segment header? Also discuss TCP connection manage-
ment. '
What is the total delay (latency) for a ?ame size of 10 million
hits that is being set up on link with 15 routers, each having
queuing time of Zps and a processing time of 1 us? The length
of link is 30001011. The speed of light inside the link is 2><108
m/sec. The link has bandwidth of 6Mbps.
(i) What is OSI Model? Explain the ?mctions and protocols and
services of each layer?
(g) What is IP addressing? How it is classi?ed? How is subnet
addressing is performed?
. (3) - P.T.O.
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Section-C
Attempt any two questions from this section. (15X2=30)
3. (1) If fragmentation needed in concatenated virtual circuit
intemets or qnly in datagram systems? Explain.
(in) What is hamming code? Explain its working with suit-
able example.
4. Answer each question:
(1) Find the class of each address.
(a) 140.213.10.80
(b) 52.15.150.11
(in) What is the type of the following address?
(a) 4F: :A234:2
(b) 52F::1234:2222
(iil) What is congestion? Name the techniques that prevent
congestion.
5. Write short notes on any three of the following:
(1) DNS in the internet
(i1) Voice Over IP
(iil) SNMP
(iv) Electronic mail
(v) File Transfer Protocol
(?9
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This post was last modified on 29 January 2020