NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY 2021 EXAMINATION

COURSE CODE: CIT381
COURSE TITLE: File Processing and Management
CREDIT: 2 Units
TIME ALLOWED: 2 Hours
INSTRUCTION: Answer Question One (1) and any other THREE (3) Questions

QUESTION ONE (25 MARKS)
a. Explain the term User Authentication and how it can be implemented ( 4 marks)
b. What do you understand by file attributes (2 marks)
c. Outline two (2) methods by which users can gain access to the programs of other users (2 marks)
d. Create five (5) students records with at least four (4) necessary fields (5 marks)
e. Classify the following file names into valid and invalid file name:
(i) Books$

(ii) Computers*

(iii) My eBook?

(iv) (Wale)

(v) Students@

(vi) Cash#
(vii) Ada;

(viii) [Godwin]

(ix) [Musa]

(x) 2020_2 (5 marks)

f. Describe the term access method (3 marks)
g. As a computer expert, explain Data Validation (4 marks)

QUESTION 2
(a) Explain the term “Data Corruption” and give examples (4 marks)
(b) Outline the causes of Data Corruption (5 marks)
(c) Outline the characteristics of naming a file and merits of naming a file (6 marks)

QUESTION 3
a. Write down five (5) attributes a file could possess. (5 marks)
b. What is File Management System? Identify 3 functions of File Management (5 marks)
c. Discuss the Basic File System and Logical I/O elements of the File System Architecture (5 marks)

QUESTION 4
a. Define Data Validation and explain three (3) methods of data validation (5 marks)

b. Outline and explain three (3) different operations supported by a File Management System.(5 marks)

c. Define a file manager and identify its six (6) common operations. (5 marks)

QUESTION 5

a. Define Sorting algorithm (6 Marks)

b. Identify and explain any three sorting algorithms techniques (6 marks)

c. Enumerate three (3) techniques used in Space Management (3 marks)