Operating System and Administration - Dec 2014

Computer Engineering (Semester 3)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.

Answer any one question from Q1 and Q2

1 (a) Define the following OS terms:
(i) Multiprogramming (ii) Multitasking
(iii) Multiprocessing
(iv) Multithreading
(v) Monolithic kernel
(vi) Microkernel.(6 marks) 1 (b) Explain the file system data structures of UNIX with neat diagram (UFDT, FT and IT).(6 marks) 2 (a) Draw and explain the block diagram of system kernel.(6 marks) 2 (b) Draw and explain the 4 state process diagram (inclusive of kernel and user modes).(6 marks)

Answer any one question from Q3 and Q4

3 (a) Explain the different types of files in UNIX. Also give the command to display the same. List the different categories of users in UNIX.(6 marks) 3 (b) Explain the following commands in UNIX: grep, ripe, stat, mount, chmod and ln.(6 marks) 4 (a) Differentiate between Grub and Lilo.(3 marks) 4 (b) Explain the run levels of Booting process in UNIX.(6 marks) 4 (c) Explain any three characteristics of perl programming.(3 marks)

Answer any one question from Q5 and Q6

5 (a) Explain in detail signal and kill function with parameters.(4 marks) 5 (b) Explain the following UNIX commands:
nice, renice, top, prstat, strace.(5 marks) 5 (c) Differentiate between the following:
(i) Modern Access Control and Real World Access Control
(ii) User mode and Kernel mode.(4 marks) 6 (a) Explain the concept of:
(i) nobody account
(ii) real, effective and save id's
(iii) setuid and setgid commands.(6 marks) 6 (b) Explain runaway processes, sudo command and su command.(3 marks) 6 (c) Explain the concept of:
(i) shadow password
(ii) pseudo users with respect to /bin/false and /bin/nologin.(4 marks)

Answer any one question from Q7 and Q8

7 (a) Give the entries of /etc/passwd file and /etc/group file.(6 marks) 7 (b) Explain the following:
(i) fsck
(ii) mkfs
(iii) file system mounting.(6 marks) 7 (c) Define disc partitioning.(1 marks) 8 (a) Explain the following:
(i) useradd
(ii) userdel
(iii) RAID.(6 marks) 8 (b) List any three storage devices.(3 marks) 8 (c) Differentiate between the following:
(i) SATA and PATA
(ii) UNIX and Linux.(4 marks)