Question Paper of CS- 68 Computer Network Dec- 2004

Q. l(a) What do you understand by simplex, half-duplex, full-duplex modes? Explain with relevant examples.

Q. l(b) Differentiate between base band and broadband communication . In which types of applications are these used/ Explain.

Q. l© (i) How do Remote Produce Calls (RPC work?

(ii) Distinguish between upward and downward multiplexing, and explain the need of multiplexing at transport layer.

Q. l(d) Describe the two methodologies used by bridges for transmission of frames. Explain the operation of bridge through proper diagram.

Q. l(e) Explain the operation of Go-Back-N. How is Selective Repeat better than Go-Back-N?

Question Paper of CS-68 Computer Network Dec 2003

Q. l(a) Differentiate between the following.
(i)Transparent and source routing bridges.

(ii)Simple, Half Duplex and Full Duplex transmission(give example(s))

(iii) Upward multiplexing and Downward multiplying.

(iv) category 3 and category 5 cables

(v) Virtual path and virtual channel.

l(b) what ate the advantages of small, fixed size cells in ATM?

1 (c ) What are gateways ? How do gateways links host lans?

l(d) What is remote Procedure call? Where is it used?

Question Paper of CS-68 Computer Network June–2004

Q. 1 (a) What are 3 factors in any network which could cause congestion?

(b) Explain the use of search frame in the working of source routing bridges.

© List three points each that differentiate one from the other in each of the following pairs:
(i) Local and Remote bridges

(ii) Constant bit rate and Variable bit rate in ATM

(iii) Time division multiplexing (TDM) and Frequency division multiplexing (FDM)

(iv) Datagram and Virtual circuit.

(v) Analog and Digital signals

(d) List the five main tasks which a modem can perform.

Question Paper of CS-68 Computer Network June- 2003

Q. 1 Differentiate between the following:
(a) Analog and Digital Data.

(b) Bit rate and Baud rate

© Base band coaxial cable and Broadband coaxial cable.

(d) Basic rate interface and primary rate interface.

(e) Cell relay and Frame relay.

(II) Discuss the following with respect to network models.
(a) Differentiate following TCP/IP and OSI model

(b) Describe the functionality of the various layers of TCP/IP network architecture and list the standard protocols supported at the various layers.

Question Paper of CS-68 Computer Network Dec-2002

Ql(i) What is the difference between bit rate and baud rate? When will the baud rate be equal to the bit rate?

Ql(ii) Is television broadcast an example of TDM or FDM or both TDM and FDM?

Q1(iii) Discuss one example each of Simplex, half duplex and full duplex transmission.

Ql(iv) Match the following to one or more of the seven OSI layers:

(a) Provides reliable and end transmission of entire message.
(b) Defines frames
© Provides user services such as electronic mail and remote login.

Ql(v) Compare between the following:

(a) Hubs and Switches
(b) Transparent bridges and source routing bridges.
© Analog and Digital Signal.
(d) Point to Point network and Broadcast Network
(e) MAN and WAN.

Question Paper of CS-68 Computer Network June-2002

Ql. Differentiate between the following:
a) Hubs and Switches
b) Point to point networks and Broadcast Networks
c) Base band and Broadband Coaxial Cable
d) Basic Rate Interface and Primary Rate Interface with respect to ISDN
e) Frequency Division Multiplexing and Time Division Multiplexing

Q1 (ii) Answer the following questions:
a) When will the bit rate be equal to the band rate?
b) Is Television/Radio broadcast TDM or FDM or both?
c) Give two examples of analog information and digital information each.
d) Give two examples of Connectionless service.

Ql(iii) Match the following to one or more of the seven OSI layers:

a) Route determination
b) Flow control
c) Access to the network for the end user
d) Switching
e) Encoding
f) Error correction and Transmission
g) Error correction and detection

Question Paper of CS-68 Computer Network Dec-2001

Ql(i). Differentiate between the following:
(a) Hubs and Switches.

(b) Transparent and spanning tree bridges:

© Basic Rate Interface and Primary Rate Interface with respect ot ISDN.

Ql(ii) Discuss the main characteristics and components of twisted pairs and base board coaxial cables.

Ql(iii) Draw an AT M network and explain through one example to understand as to how the ATM network works?

Question Paper of CS-68 Computer Network June-2001

Q l (i) Explain how the notion of layering and internetworking make the rapid growth of applications such as the WWW possible.

Ql(ii) What universal set of communications services is provide by TCP/IP?

Ql(iii) Suppose transmission channels becomes virtually error free. Is the data link layer still needed?

Ql(iv) With reference to ISO reference model, point out which layer/layers carry the following functions:

1. Text/Data Compression
2. Virtual Terminal Management
3. Connection management
4. Error free data transmission
5. Deadlock free.

Ql(v) With respect to WAN, distinguish between virtual circuit service and datagram service.

Ql(vi) What is the difference between a confirmed and unconfirmed service? For each of the following tell whether it might be a confirmed service and unconfirmed service, both nor neither:

1. Connection establishment
2. Data transmission
3. Connection release

Question Paper of CS-68 Computer Networks Jan.-2001

Ql(i). Which transmission mode (Simplex, half duplex or full can be compared to the following? Justify your answer.
(i) Counseling Session being
(ii) A Computer to printer
(iii) A radio broadcast
(iv) A telephonic conversion

Ql(ii) Which OSI layer is responsible for the following:
a) Providing end to end communicate with reliable service
b) Providing node to mode communication with reliable service
c) Fragmentation
d) Congestion handling
e) Remote login
f) Crash recovery

Ql(iii) Match the following to a topology types:
(i) New devices can be added easily
(ii) Control is through a central device
(iii) Failure of a device not cause system failure

Ql(iv) List the basic specifications for the following cable types:
(a) Twisted-Pair cables
(b) Coaxial cables
© Fiber optic

Ql(v) What advantages does TCP have over UDP, what are the features which make TCP a reliable protocol?

Ql(vi) Should Connection establishment be a confirmed service or unconfirmed services ? what about data transfer in a connection-oriented services ? Connection release?

Question Paper of CS-70 Introduction to Software Engineering Dec-2004

Ql.(a) Software is the differentiating characteristic in many computer based products and systems. Provide examples of two products and at least one system in which software, not hardware, is the differentiating element. Explain your answers.

(b) What are Software Libraries and Software Toolkits? Give an example for each. What are Software Modules? How will you reapply them? Also give an example of a! S/W module.