NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
APRIL 2019 EXAMINATION

Course Code:             CIT832                                                           

Course Title:              Operating Systems and Networking

Course Credit            Unit: 2

Time Allowed:           2Hours

Instruction:                Answer Question 1 and any other three (3) questions

Question 1:

1. 1. State and give the requirements of a secure distributed system              3marks
   2. Differentiate between Network Operating System and Distributed Operating System?        4marks
   3.  What are the major advantages of Distributed operating system?   2marks
   4. Briefly explain Multiprocessor Operating Systems                    2marks
   5.  List any four components used to connect two or more networks                     2marks
   6.  Differentiate between Repeaters and Bridges, stating their feature and purpose  4marks
   7. What is TFTP?  (2 marks)
   8. What protocol is used in TFTP for data transport?      (2 marks)
   1.  How is TFTP session initiated?           (2 marks)
   10.  How is integrity maintained using TFTP?                   (2 marks each)

(25 marks)

Question 2: 

a.) Compare multiprocessing and multiprogramming? (6 marks)

• 2. List three protocols that are included in the TCP/IP suite of protocols.   3marks
  3. Describe the following
• ICMP (2 marks)
• RIP and(2 marks)
•  ARP/RARP? (2 marks)

Question 3

a        What are the three main purposes of an operating system?     (7 marks)

0. 2. Explain the main difficulty a programmer must overcome in writing an operating system for a real-time environment?    (3 marks)
   3. To build a robust distributed system, you must know what kinds of failures that can occur.
1. List three possible types of failure in a distributed system.         (3 marks)
2. Specify which of those in your list are applicable to a centralized system. (2 marks)

Question 4:

a. Name the system folders that are created in Windows 2000 to store program and data files; .         (3 marks)

b. In Windows 2000 Directories: Describe the following :

• My Document,
•  My Computer and
• My Network Places?    (6 marks)

c. What is a Forest?    2marks

d. What is Auditing in Windows 2000?   2marks

e. What specific events can be Auditing in Windows 2000?  2marks

Question 5:

1. 1. 1. what is the function of each the following Linux command library and special characters:

cal, who, ^u, ^c, AD, Is –a    (6marks)

1. 1. 2.  what are the contents of the following Linux Directories:  

/dev, /etc,  /lib      (3 marks)

1. 1. 3.   What is the result of the following Linux File Manipulation Commands including their various options if any?  (6 marks)