Subject: Computer Science ime Allowed: 2:30 Hours University of Sargodha BS 3d Term Examination 2017.

Subject: Computer Science

ime Allowed: 2:30 Hours

University of Sargodha

BS 3d Term Examination 2017.

Paper: Computer Communication & Network (CMP: 2540)

Maximum Marks: 80

Objective Part Compulsory

Q-1; Answer the following question briefly.

1. What are the components of data communication system?

2. What is compression? Which layer is responsible for compression?

3. What is reflection?

4. What type of addresses are used in Network and Data Link layer?

5. Define digital to analog conversion.

6. How does sky propagation differ from line-of-sight propagation?

7. What is the goal of multiplexing?

& Difference between Half-duplex and full-duplex?

¡ 9, Dęfine two main categories of network.

10, Which connectors are used in fiber optic cable?

1l What are the two types of line configuration?

112 Define infrared waves. Give an example.

13. What is handoff?

14. what is the difference between switch and router?

15. Why are protocols needed?

16. How does single bit error differ from burst error?

usta 2x16=32

Subjective

Attempt any four (4) questions

4x12 = 48

Q-21 Explain OSI model with functionality of each layer.

Q-3. Disçuss the steps involved in a typical call originated from a mobile user to a

fixed subscriber.

Q-4: What are the advantages and disadvantages of fiber optic cable?

Q-5: Discuss radio waves and microwaves.

Q-6:

Discuss the techniques used in serial transmission.

Q-7;, Discuss transmission impairments in detail.

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