Paper D 2006

University Of Peshawar Computer Science (Part-II) Paper-D 2006 Time: 3 hrs

Maximum Marks: 25

Note: Attempt any FIVE questions selecting TWO questions from section-A and three from section-B. All questions carry equal marks. SECTION-A Q1. Q2.

Q3. Q4.

Define Data and Data Communication. What are the modes of data communication? Explain each with examples (5) a) What is Networking? Write different components of networking (3) b) Discuss the following medium of transmission (2) (i) Satellite (ii) Fiber-Optics Write the difference between the following: a) LANs and WANs b) Peers to Peers network and Server based Network. Write a note on the following: a) Speed of Communication b) Working of Ethernet. SECTION-B

Q5. Q6. Q7. Q8. Q9.

What is operating System? Write types of function of operating system. What is meant by the process? Draw and explain process state transition diagram using five states. What is scheduling? Write any two scheduling policies in detail. Define Files. Write the difference between the following a) Sequential File and Index Sequential files. b) Direct or random access files and index sequential file. Explain the following with example: a) Time Sharing b) Multi-processing c) Batch Processing d) Multi Programming e) Real Time Processing.

Q10. Write syntax, purpose and examples of the following UNIX commands. (a) Ls (b) mv (c) cp (d) pwd (e) chmod ------------------------------------