DEPARTMENT OF COMPUTER SCIENCE AND
ENGINEERING
CS2302 – COMPUTER NETWORKS
UNIT I
2 MARKS
1.
What is the difference between port
address, logical address and physical address? [MAY/JUNE 2014]
2.
What will the maximum number of frames
sent but unacknowledged for a sliding
window
of size n – 1 (n is the sequence number)? [MAY/JUNE 2014]
3.
Define a layer. [NOV/DEC 2013]
4.
What do you mean by framing? [NOV/DEC 2013]
5. Give
the purpose of layering. [MAY/JUNE
2013]
6. What
is the use of two dimensional parity in error detection? [NOV/DEC 2012]
7. What
are the issues in datalink layer? [NOV/DEC
2012]
8.
What is flow control? [NOV/DEC 2011]
9.
Define Error detection and correction. [NOV/DEC 2011]
10. What
are the functions of application layer? [APR/MAY
2011]
11. Define
bit stuffing. [APR/MAY 2011]
12. What
are the two types of line configuration? [NOV/DEC
2010]
13. What
do you mean by error control? [NOV/DEC
2010]
14. What
do you mean by error control? [NOV/DEC
2010]
15. How
does a single bit error differ from a burst error? [NOV/DEC 2008]
16. Mention
the components of a data communication system. [NOV/DEC
2008, ECE]
17.
What are the advantages of wireless
media over wired media? [NOV/DEC 2008,
ECE]
18.
What is the significance of twisting in
twisted pair cable? [MAY/JUNE
2008]
19.
Which of the OSI layers handles each of
the following [NOV/DEC 2009]
(a) Dividing the transmitted bit streams
into frames
(b) Determining which route through the
subnet to use
20.
What are the advantages of wireless media over wired media? [NOV/DEC 2009]
16
MARKS
1.
Given a remainder of 111, a data unit of
10110011 and a divisor of 1001, is there
an
error in the data unit. Justify your answer with necessary principles. (16)
[MAY/JUNE 2014]
2. How
is frame order and flow control is achieved using the data link layer? (16)
[MAY/JUNE 2014]
3. Discuss
the ISO OSI model. (16) [NOV/DEC
2011, NOV/DEC 2010, NOV/DEC 2009]
4. Explain
the different Types of multiplexing.(16) [NOV/DEC
2011]
5.
Explain in detail about the following.
(16) [APR/MAY 2011]
a. PPP
b. SONET
c. HDLC
6.
Explain various types of transmission
media in detail with their advantages and disadvantages. (16) [MAY/JUNE
2013 –CS1302]
(ii)Describe
how bit stuffing works in HDLC protocol. (8) [NOV/DEC
2013]
8. Suppose we want to transmit
the message 11001001
and protect it from
errors using the CRC polynomial x3 + 1. Use polynomial long
division to determine the message that should be transmitted. (16) [NOV/DEC 2013]
9. i)
Explain the following error detection method, Cyclic Redundancy Check. (8)
[NOV/DEC 2012, NOV/DEC 2010]
ii)
Discuss briefly about Link Level Flow control
(8)
10. i)
Discuss the framing technique used in HDLC. What is the effect of errors on
this framing? (8) [MAY/JUNE
2013]
ii)
Discuss the principle of stop and wait flow control algorithm. Draw time line
diagrams and explain how loss of frame and loss of an ACK are handled. What is
the effect of delay-bandwidth product on link utilization? (8)
UNIT II
2 MARKS
1. What
is the average size of an Ethernet frame? [MAY/JUNE 2014]
2. What
is the access method used by wireless LAN? [MAY/JUNE 2014]
3. How
does an FDDI node determine whether it can send asynchronous traffic and
synchronous traffic. [MAY/JUNE 2013]
4. What
are the functions of bridges.
[NOV/DEC 2010, 2011]
5. What
is the advantage of FDDI over a basic Token Ring? [NOV/DEC 2010]
6. List
the main two limitation of bridges. [NOV/DEC 2013]
7. Define
source routing. [NOV/DEC 2013]
8. Mention
some of the physical properties of Ethernet. [ APR/MAY 2011]
9. How
is the minimum size of an Ethernet frame determined?[MAY/JUNE 2013]
10. What
is CSMA/CD? [NOV/DEC 2011]
11. Differentiate
fast and gigabit Ethernet? [NOV/DEC 2012]
12. What
is the difference between switch and bridge? [NOV/DEC 2012]
13. Define
a Bridge. [NOV/DEC 2010]
14. Write
notes on CSMA. [NOV/DEC 2010]
15. Compare
the performance of 1 – persistent and non-persistent CSMA protocols in terms of
channel utilization under varying loads. [NOV/DEC 2009]
16. Name
the timers used in FDDI. [MAY/JUNE 2012]
17. Define
Piggy Backing. [MAY/JUNE 2013, ECE]
18. Mention
the types of Bridges. [MAY/JUNE 2013,
ECE]
19. Differentiate
between logical address and physical address. [APR/MAY 2011, ECE]
20. What
is burst error? [APR/MAY 2011, ECE]
16 MARKS
1. Describe
the CSMA/CD protocol and comment on its performances for medium access. (16) [MAY/JUNE
2014]
2. Write
short notes on : (16) [MAY/JUNE 2014]
i.
FDDI
ii.
Bridges and switches
3. Discuss
the problems encountered in applying CSMA/CD algorithm to wireless LANs. How
does 802.11 solve these problems. (16) [MAY/JUNE
2013]
4.
i) Describe the transmitter algorithm
implemented at the sender side of the Ethernet. Why should Ethernet frame
should be 512 bytes long? (8) [NOV/DEC
2013]
ii) Explain the hidden node and
exposed node problem addressed by 802.11. (8) [NOV/DEC
2013]
5. Discuss about physical properties and medium
access protocol of Ethernet. (16) [MAY/JUNE 2012].
6.
Explain about physical properties, timed
token algorithm, frame format of FDDI.
(16) [NOV/DEC 2011,MAY/JUNE 2012].
7.
Explain in detail about token ring and
its frame format. (16) [NOV/DEC 2011,NOV/DEC
2013].
8.
i) Explain how bridges run a distributed
spanning tree algorithm. (8) [APR/MAY
2011].
ii) Explain the physical properties of Ethernet
802.3 with necessary diagram of Ethernet transceiver and adaptor. (8) [NOV/DEC 2012]
9. Explain CSMA in
detail. (16) [APR/MAY 2011,
NOV/DEC 2012]
10. Explain the functioning of wireless
LAN in detail. (16) [NOV/DEC 2010,
MAY/JUNE 2012, R4].
UNIT III
2 MARKS
1.
What is the network address in a class A
subnet with the IP address of one of the hosts
as 25.34.12.56 and mask 255.255.0.0?
[MAY/JUNE 2014]
2.
Differentiate circuit and packet switched
networks. [MAY/JUNE 2014]
3.
What is the need of subnetting. [NOV/DEC
2013]
5.
Compare circuit switching and virtual
circuit based packet switching, in respect of queuing and forwarding delays.
[MAY/JUNE 2013]
6.
Differentiate between connectionless
operation and connection oriented operation. [MAY/JUNE 2013]
7. What
is DHCP? [NOV/DEC 2012]
8. What
are the salient features of IPV6? [NOV/DEC 2012]
9. Expand
and define MTU. [MAY/JUNE 2012]
10. Mention
any four applications of multicasting. [MAY/JUNE 2012]
11. Write
on the packet cost referred in distance vector and link state routing. [MAY/JUNE
2012, 2004 regulation]
12. State
the functions of LLC. [MAY/JUNE 2012, 2004 reg]
13. State
the rules of non-boundary level masking. [MAY/JUNE 2012, 2004 reg]
14. Define
subnetting. [NOV/DEC 2011]
15. List
the difference between circuit switching and packet switching. [APR/MAY 2011]
16. What
are the different kinds of multicast routing? [APR/MAY 2011]
17. What
is meant by circuit switching? [NOV/DEC 2010]
18. What
is multicasting? [NOV/DEC 2011, 2010]
19. What
is the function of a router? [NOV/DEC 2010]
20. State
the duties of network layer. [APR/MAY 2010, ECE]
16 MARKS
1.
Explain the RIP algorithm with a simple
example of your choice. (16) [MAY/JUNE 2014]
2.
i. Discuss the IP addressing methods. (16)
[MAY/JUNE 2014]
ii. Write short notes on ARP.
3.
Describe the Distance vector routing
protocol with examples. (16) [NOV/DEC 2013]
4.
i) A 4480-byte datagram is to be
transmitted through an Ethernet with a maximum data size of 1500 bytes in
frames. Show the values of Total Length, M flags, identification and offset
fields in each of the fragments created out of the datagram. (10)
ii) Discuss the principle of reliable
flooding and its advantages and applications. (6) [ MAY/JUNE 2013]
5.
i)For the following network, develop the
datagram forwarding table for all the nodes. The links are labeled with
relative costs. The tables should forward each packet via the least cost path
to destination. (10)
ii) What is the need for ICMP? Mention
any four ICMP messages and their purpose. (6) [MAY/JUNE 2013]
6. i)
Explain in detail about ARP. (10) [NOV/DEC
2012]
ii) What is subnetting?
Explain (6)
7. Explain
the following: (16) [NOV/DEC 2012]
i.
Error Reporting (ICMP)
ii.
Inter Domain Routing
8. Discuss
briefly about RIP and OSPF. (16) [MAY/JUNE 2012]
9.
Write about IPv6 in detail. What are its
new features and improvements?
(16) [MAY/JUNE 2012, NOV/DEC
2011, 2010]
10. Compare circuit
switching with packet switching. (16)
[NOV/DEC 2011]
UNIT IV
2 MARKS
1.
Define slow start. [MAY/JUNE 2014]
2.
When can an application make use of UDP?
[MAY/JUNE 2014]
3.
Differentiate flow control and
congestion control. [NOV/DEC 2013,
APR/MAY 2011]
4.
Differentiate delay and jitter. [NOV/DEC 2013]
5.
Why is UDP pseudo header included in UDP
checksum calculation? What is the effect of an invalid checksum at the
receiving UDP? [MAY/JUNE 2013]
6.
How can effect of jitter be compensated?
What type of applications requires this compensation? [MAY/JUNE 2013]
7.
What is meant by PORT or MAILBOX related
with UDP? [NOV/DEC 2012]
8.
List out the various features of sliding
window protocol. [NOV/DEC 2012]
9.
Draw TCP header format. [MAY/JUNE 2012]
10.
What do you mean by QoS? [MAY/JUNE 2012]
11. What
is TCP? [NOV/DEC 2011]
12. Define
Congestion. [NOV/DEC 2011]
13.
Give the approaches to improve QOS? [NOV/DEC 2011]
14.
What are the advantages of using UDP
over TCP? [NOV/DEC 2010]
15.
What types of applications prefer UDP
rather than TCP? [NOV/DEC 2009]
16.
Mention any two responsibilities of
transport layer. [MAY/JUNE 2013, ECE]
17.
What is the need for UDP socket? [MAY/JUNE 2013, ECE]
18.
What is the retransmission timer? [MAY/JUNE 2014, ECE]
19.
Draw the UDP header. [MAY/JUNE 2014,
ECE]
20.
Compare UDP and TCP. [MAY/JUNE 2013,
ECE]
16 MARKS
1.
Explain the principles of congestion
control in TCP. (16) [MAY/JUNE 2014]
2.
Discuss the Random Early Detection mechanism
and derive the expression for drop probability. (16) [MAY/JUNE 2014]
3.
i) Describe how reliable and ordered
delivery is achieved through TCP. (8) [NOV/DEC
2013]
ii) Why does TCP uses an adaptive
retransmission and describe its mechanism. (8)
4. What
is the need for Nagle’s algorithm? How does it determine when to transmit
data? (8) [MAY/JUNE 2014]
5.
Draw and explain TCP state transition
diagram. (16) [MAY/JUNE 2012, APR/MAY 2011, 2004 REG]
6.
Explain the following: (16) [MAY/JUNE 2012]
(i) DEC bit
(ii) RED
7. Illustrate
and explain UDP and its packet format. (16) [NOV/DEC 2011, MAY/JUNE 2013, 2004
REG]
8.
Explain in detail about TCP congestion
avoidance algorithm. (16) [NOV/DEC 2011]
9.
Explain adaptive flow control in detail
and its uses. (16) [ NOV/DEC 2010]
10.
With neat architecture explain TCP in detail. (16)
[NOV/DEC 2010]
UNIT
V
2
MARKS
1. What DNS cache issues are
involved in changing the IP address of a web server host name? (Dec 2013)
2. Differentiate
application programs and application protocols (Dec 2013)
3. What
are the advantages of allowing persistent TCP connections in HTTP? (May 2013)
4. Is a cryprographic hash function, an
irreversible mapping? Justify your answer (May 2013)
5.
What is simple mail transfer protocol? (Dec
2012, Dec 2010)
6.
Why name servers are sometimes called as middleware? (Dec 2012)
7.
What is TeLnet? (May/June2014,
Dec 2011)
8.
State the purpose of SNMP. (Dec
2011)
9.
What is PGP? (May/June 2014, May/June 2012, Dec 2010)
10.
List the function of POP3? (APR/MAY
2011)
11.
What are the applications of telnet? (APR/MAY
2011)
12.
Define Cyber text. (ECE,
MAY/JUN 2013)
13.
Expand URL and URI and write one example for each of them. (ECE, MAY/JUN 2013)
14.
Differentiate between FTP and TFTP protocols? (NOV/DEC
2009)
15.
What are the limitations of symmetric cryptosystems. (NOV/DEC 2009)
16.
Define SNMP. (MAY/JUNE 2012)
16 MARKS
1. Explain the SNMP protocol in
detail (16)
(MAY/JUN 2014)
2. Write short notes on: (16)
(MAY/JUN 2014)
i) DNS
ii) FTP
3. Describe the message format
and the message transfer and the underlying protocol involved in the working of
the electronic mail (16) (Dec 2013)
4. Explain with example (16) (Dec 2013)
(i)
HTTP (Dec 2010)
(ii)
RTP
5. Discuss the need for name
resolution. Illustrate the domain name hierarchy and the steps in resolution (16) (May 2013)
6. Illustrate the features of FTP
and its operation (8) (May 2013)
7. Illustrate the features of TELNET. What is the
need for network virtual terminal? (8) (May
2013, Dec 2012)
8. Explain the various operation
involved after typing the URL in the task bar
(8) (Dec 2012)
9. Write short notes on the
following (16) (Dec 2012)
(i) HTTP
(ii)
E-mail
10. Discuss in detail about DNS
and its frame format (16) (Dec 2011, Dec 2010)
11. Explain SMTP in detail (16) (Dec 2011, Dec 2010)
