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2

DATA COMMUNICATION AND COMPUTER

NETWORKS

IMPORTANT QUESTIONS(MAY/JUNE
-
2002)

PART
-
A


1. Draw the OSI reference model and indicate the data flow.

2. What is meant by synchronous TDM? Give a schematic.

3. What is a time wa
tch? Briefly present the configuration.

4. What is a virtual circuit? Give its advantages.

5. Differentiate between Baseband and Broadband LANs.

6. Give the token ring frame format.

7. What is meant by connectionless mode transport service?

8. Differenti
ate between TCP and UDP Protocols.

9. What is meant by source routing bridge?

10. Give the ISDN channels and rates.

PART
-
B

11. (a) What is Computer Network? Give its advantages.


(b) Explain the Data link control procedures for different link

configurations.

12. (a) Give the functional diagram of a digital PBX . Explain its enhanced
services to users.

(b)Explain the packet switching in X
-
25 networks.

13. (a) Present the layered architectu
re of LANs . Explain the LLC and MAC
Headers of a LAN frame.

(b) Describe the CSMA/CD protocol in detail.

14. (a) Explain the Transport connection establishment and release in
transport layer.

(b) Present the basic function of bridge and router . Briefly e
xplain source
routing.

15. (a)Explain the encryption and decryption processes that use public keys.

(b). Give the N
-
ISDN and B
-
ISDN rates , interfaces and services.

16. (a) Compare the OSI and SNA architectures.

(b) Discuss about e
-
mail applications.

17. W
rite short notes on any two:

(a) Flow control

(b) Digital PBX

(c) SNMP













3




DATA COMMUNICATION AND COMPUTER NETWORKS

IMPORTANT QUESTIONS(APRIL/MAY
-
2005)

PART
-
A

1. What is meant by error control ?

2. What is the principle of s
tatistical TDM?

3. What is the significance of routing table?

4. What is the need for congestion control?

5. What are advantages of optical fibers ?

6.Give two examples for high speed and low speed L;ANs.

7. What is the need for internetworking?

8. Differ
entiate between bridge and router.

9. What is the need for encryption?

10. What is cell relay?

PART
-
B



11. (a) What are the principles used in layered architecture?


(b) what are the merits and demerits of TCP/IP model over ISO’s OSI
model?


12. E
xplain different types of ARQ techniques in detail.

13. Explain token ring protocol with the help of timing diagram . Explain
RAT and RAR protocols.

14. Draw TCP/IP model and explain the function of each layer.

15. Explain any 3 compression algorithms.

16.

(a) Explain any 2 congestion control algorithms.


(b) Describe IEEE 802.6.

17. Write short notes on


(a) BIS
D
N


(B) Public key cryptography

















4





IMPORTANT QUESTIONS(APRIL/MAY
-
2003)

PART
-
A

1.

What is the need for mult
iplexing? Mention different multiplexing
techniques.

2. What is meant by routing? Give the significance of routing table.

3. Differentiate between connection oriented and connectionless services.

4. Describe data link layers of LANs.

5. Give examples f
or low speed and high speed LANs.

6. Differentiate between Narrow band , ISDN and BISDN.

7. Differentiate between ISO’s OSI model and TCP/IP model.

8. Define BRIDGE , ROUTER and GATEWAY.

9. Give Token and Frame format in Token Ring LAN.

10.Why deadlocks i
n data communication networks occur? Mention
different types of deadlocks.

PART
-
B


11. Explain the functions of each layer in ISO’s OSI model with the help of
a neat sketch.

12. Explain Selective Repeat Protocol and differentiate between SRP and
Go
-
Back
-
Np
rotocols.

13. (a) What is the need for switching?


(b) Explain Circuit Switching and Packet Switching. Mention their
advantages(merits),de
-
merits and applications.

14. Describe Ethernet LAN with neat layout diagram and give frame
format.

15. Explain

TCP and UDP in detail.

16. (a) Describe Fiber Optic Ring Networks with a neat sketch.


(b) Explain ASN
-
1(Abstract Syntax Notation 1)

17. Write short notes on any 2 0f the following
-

(a) Electronic Mail

(b) ATM

(c) Public Key Cryptography.














5










DATA COMMUNICATION AND COMPUTER NETWORKS

IMPORTANT QUESTIONS(MAY/JUNE
-
2001)

PART
-
A

1. Why layered architecture is used in data communication networks ?

2. Differentiate between flow control and error control.

3. Write the sequence of even
ts that occur during call establishment and
termination in circuit switching.

4 .What is meant by logical channel in X.25 packet switching?

5. Give the configuration of the ring interface unit.

6. Give the format of IEEE 802.3 LAN frame.

7. What are QOS pa
rameters used in transport layer?

8. Give the TCP/IP protocol suite reference model.

9. What is meant by internetworking? Give the components that facilitate
this.

10.Differentiate between frame relay and cell relay.


PART
-
B

11.(a) Draw the block diagram a
nd explain about components of a data
communication networks.


(b) Define multiplexing, FDM and TDM. Explain STDM and its
advantages.

12.(a) What is a digital switch? How is it implemented?


(b) Describe the Routing and traffic control in packet sw
itched networks.

13.(a) Explain about the media access control protocols.


(b) Illustrate the token bus protocol.

14.(a) Briefly describe the SNA architecture.


(b) Distinguish between connection oriented and connection
-
less oriented
internetworkin
g.

15.(a) Explain the session layer and presentation layer services.


(b) Briefly describe about the Narrowband and Broadband ISDN
architecture.

16.(a) Explain different types of transmission media employed in computer
networks.


(b) Compare OSI and

TCP/IP protocol suites.

17. Write short notes on any two of the following.:


(a) Data link control.



6


(b) X.25 packet switching.


(c) ISDN.













DATA COMMUNICATION AND

COMPUTER NETWORKS

IMPORTANT QUESTIONS(NOVEMBER/DE
CEMBER
-
2004)

PART
-
A

1. What is Transmission Impairment? Explain.

2. Sketch the Manchester Encoding for the bit stream 0001110101.

3. Give the Socket Address structures for Internet and XNS family.

4. Write about CIDR.

5. What is maximum burst length on a
155.52 Mbps ATM ABR connection
whose PCR value is 200000 and L value is 25 Micro seconds?


6. State and explain the Optimality principle with an example.

7. Draw and explain the different ATM cell formats.

8. How is channel utilisation doubled in slotted A
loha?

9. What are Message Digests?

10.List the transport layer QOS parameters.


PART
-
B

11.(a) Write about IEEE 802.4 standard.


(b) Explain Adaptive tree walk protocol.

12. With the help of a neat diagram explain the IP header.

13.(a) How is Routing do
ne in Mobile hosts?


(b) Write about congestion control in VC subnets.

14.(a) Compare and contrast Leaky bucket and token bucket congestion
control mechanisms.


(b)A computer on 6 Mbps is regulated by token bucket. It is filled at the
rate of 1 Mbp
s. It is initially filled to capacity of 8 megabits. How long can
the computer transmit at the full speed of 6 Mbps?

15.(a) How is addressing issue addressed in Transport Layer ?


(b) write about TCP protocol. Briefly explain TCP transmission policy.

1
6.(a) Explain SNMP model and its working.



7


(b) An SNMP integer whose value is 200 has to be transmitted.Show the
binary representation of the bits sent in the ASN.1 transfer syntax.

17. Write short notes on :


(a) DES Algorithm.


(b) Out
-
of
-
Ban
d data.


(c) ISDN system architecture.











DATA COMMUNICATION AND COMPUTER NETWORKS

NOVEMBER 2005 (MAIN)

PART
-

A

1.

What is the need for data communication networking?

2.

What is the necessity of multiplexing?

3.

What is meant by control signaling?

4.

Descri
be routing table.

5.

Mention different network topologies.

6.

What is IEEE 802.2 ?

7.

What are the principles used in layering in layered architecture ?

8.

Describe TP4.

9.

What is the need for data encryption ?

10.

Explain the principle of frame relay.


PART
-
B


11.

Draw OSI ref
erence model and explain the functions of each layer.

12.

What are different switching techniques ? Explain them in detail.

13.

Give the layout of IEEE 802.3. Explain the MAC protocol used in this.

14.

(a) Draw TCP/IP model and explain the functions of each layer.



8

(b)

What are the merits and demerits of TCP/IP model over OSI model ?

15.

(a) Explain the principle of public key cryptography in brief.

(b) Describe DES algorithm.

16.

Write short notes on:

(a)

Go back N ARQ

(b)

X.25 packet switching

17.

Write short notes on:

(a)

IEEE 802.6

(b)

Interne
tworking.


DATA COMMUNICATION AND COMPUTER NETWORKS

APRIL 2006 (SUPPLEMENTARY)

PART
-
A

1.

What is meant by flow control ?

2.

What is the need for error control ?

3.

What is the need for routing table ?

4.

What is deadlock ? Mention types.

5.

Mention different network top
ologies.

6.

What is IEEE 802.2 ?

7.

What is UDP ?

8.

Differentiate between bridge and router ?

9.

What is the need for data compression ?

10.

Mention the principle of cell relay.

PART
-
B

11.

Write detailed notes on ARQ techniques.

12.

(a) Differentiate between packet switching and

circuit switching.

(b) Give two solutions for deadlocks.

13.

Give the layout and explain protocol of IEEE 802.4 in detail. Give token and
frame format.

14.


(a) Draw TCP/IP model and explain the function of each layer.



9


(b) What are the merits and demerits of TCP
/IP model over OSI model.

15.

(a) List the type of channels used in ISDN.

(b) Differentiate between ISDN & BISDN.

16.

Write short notes on:

(a)

STDM

(b)


Digital Private Branch Exchange.

17.

Write notes on:

(a)

Principle of internetworking

(b)

SNMP.



DATA COMMUNICATION AND COMPUTER
NETWORKS

SEPTEMBER 2001 (SUPPLEMENTARY)

PART
-
A

1.

List the components of a data communication system.

2.

Explain different line configurations for data communication.

3.

What is a PBX ? Give salient features of a digital PBX ?

4.

How are the packets routed ?

5.

Draw the
optical fiber bus topology used in FDDI man.

6.

Give the Frame Format used in IEEE 802.4.

7.

How is a transport layer connection established ?

8.

What is a router ? Explain its role in internetworking.

9.

Give the session layer services.

10.

Differentiate between public k
ey and private key.

PART
-
B

11.

(a) Illustrate the functional details of OSI model and the data movement through different
layers.

(b) Define synchronous TDM and give the associated standards. How is statistical TDM
necessary in modern computer networks.

12.

(a) Ex
plain the principles of space and time switches.

(b) Describe the virtual circuit and datagram services.



10


13 (a) Differentiate between LAN, MAN and WAN. Explain the topologies used in


them.


(b) Describe the token passing protocol in ri
ng networks.


14 (a) List any three functions of transport layer and explain them.


(b) Briefly describe the TCP/IP protocol for internetworking applications.


15 (a) Explain the SNMP protocol for network management.


(b) Illustrate Frame Rel
ay for data communication.


16 (a) Differentiate between bridge, router and gateway.


(b) Explain the design issues involved in MAC sub layer.


17. Write short notes on any TWO of the following. a) DQDB b) Error control c) TCP/IP

DATA COMMUNIC
ATION AND COMPUTER NETWORKS

SEPTEMBER 2002 (SUPPLEMENTARY)

PART
-
A

1.

Describe in brief about transmission modes

2.

What are advantages of a multipoint connection over a point to point connection?

3.

List the responsibilities of the transport layer.

4.

What is the diff
erence between bit rate and band rate? Give an example where both are
the same.

5.

Explain about datagram approach to packet switching.

6.

Describe in brief FDDI architecture of LAN.

7.

What signifies IEEE 802.6?

8.

Assume three token ring LANs are connected by one br
idge. What happens if the bridge
fails?

9.

what are the advantages of using UDP over TCP ?

10.

Describe the frame format used with SONET.

PART
-

B

11.

a) Draw the simplified block diagram of a data communication network. Describe each
block.

b) List the seven layers i
n OSI reference model.

12.

a) Compare static and dynamic routing techniques.



11

b) Write a note on digital private branch exchange.

13.

a) Explain IEEE 802.5 LAN. b) Write about Medium access control protocols.

14.

a) Differentiate the roles of transparent and non
-
transp
arent bridges.

b) Explain about TCP/IP protocol suit.

15.

a) Describe the functions of session layer.

b) Describe the functions of presentation layer.

16.

a) Discuss any one standard employed for encryption of data in computer networks.

b) Write a note on Network
Management.

17.

Write short notes on:

a)

Transmission impairments b) Shortest path routing.