Introduction to

Computer System
47
Answers:
1. 
B
2. 
Because RAM is volatile and ROM cannot be changed, there must be places 
to store data and programs outside of the computer’s main memory. Such 
places are called secondary storage devices.
3. 
ALU- performs arithmetic/logic operations
4. 
Control Unit- controls the various parts of a computer hardware
5. 
Memory- stores both data and program
6. 
Magnetic tape is a cheap medium for storing great quantities of data.
However, data items cannot be directly addressed on tape. To reach a data 
object, all information recorded before the one you want must be read and 
discarded.
7. 
The stored program concept means that data and instructions are both 
logically the same and can both be stored in memory. The von Neumann 
architecture is built around this principle. It is important because the human 
does not have to execute instruction from without the machine. Instructions 
can be stored in memory and executed in sequence referencing the data 
values it needs on which to operate.
References:
1. 
Von Neumann Architecture, 
http://www2.cs.siu.edu/~cs401/Textbook/ch2.
pdf. 
2. 
TheTeacher.info, 
http://theteacher.info/index.php/f453-advanced-theory/3-
3-3-architectures/notes/192-von-neumann-architecture-notes
, Date 
accessed, February 2016.
3. 
Wiki Page, 
https://en.wikipedia.org/wiki/Von_Neumann_architecture
, Date 
accessed, February, 2016.
4. 
Wiki Page, 
https://en.wikipedia.org/wiki/Peripheral
, February, 2016.
5. 
Wiki page, 
https://en.wikipedia.org/wiki/Software
, February, 2016.

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Introduction To Computer Science
48
Unit 3: The Internet
This unit presents a brief history of the Internet, which is one of the most critical and 
indispensable technological tool of our time. It describes the origin of the Internet, the initial 
internetworking, and all the important milestones that the Internet technology has gone 
through since its emergence. 
Unit Goals
Upon completion of this unit the learner should be able to: 
• Describe the important milestones that led to the establishment of the Internet as 
we know it today;
• Describe the application of the Internet;
• Explain the Internet as the most crucial vehicle of resource repository in the 
teaching and learning process; and
• Describe the components of the Internet technology.