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Posted By: b.thirumaya prabhu Member Level: Gold Posted Date: 22 May 2008
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2008 Anna University M.C.A. Computer Aplications MC 1751 UNIX AND NETWORK PROGRAMMING 2008 Question paper
M.C.A Degree Examination, May/June 2008
Fourth Semester
MC 1751 UNIX AND NETWORK PROGRAMMING
(Regulation 2005)
Answer All Questions
PART A
1. How is a system call different from Library function?
2. What is a symbolic link? What is its use?
3. What are the fields present in the environment list?
4. Name two signals that are raised on some software conditions/
5. What are the limitations of pipes?
6. What happens if the argument to popen is a non existent command?
7. What all packets are received by a raw socket waiting at protocol 6?
8. Name two UDP related socket options.
9. What ICMP messages are used by traceroute?
10. What is the difference between well-known port number and ephemeral port number?
PART B
11. (a) (i) What is the goal of buffering provided by standard I/O library? Explain the various types of buffering. (3+9 marks)
(ii) Write a note on stickey bit. (4 marks)
or
(b) (i) Explain the various data structures maintained by the Unix system with regard to file sharing. (9)
(ii) How is remove( ) different from unlink( )? Give the syntax to both functions. (4+3 marks)
12. (a) Explain with a block diagram how a C program is started and terminated with necessary function calls required.[16 marks]
or
(b) Write a note on the following with examples:
(i) Unreliable signals.
(ii)Reenterant functions.
(iii) system( ) function.
13. (a) (i) Explain how semaphore provides access to a shared object for multiple process.[8 marks]
(ii) Explain the various function calls defined in Unix for implementing semaphores.[8 marks]
or
(b) Explain the operation of pipe with an example application.
14. (a) Write an application to send an IP datagram using RAW socket by filling the header and with a message. The receiver should echo back the message by altering the header.[16 marks]
or
(b) Write a note on the following function calls by specifying the syntax, operation and necessity.[4*4 marks]
(i) listen( )
(ii) inet_pton( )
(iii) setsockopt( )
(iv) recvfrom( )
15. (a) Explain the implementation of the tools, ping and traceroute.[16marks]
or
(b) Write a TCP based echo server. Test its functionality with an echo client to calculate the RTT between the client and server.[16 marks]
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