There are security concerns associated with cloud storage.
(a) State one way in which providers of cloud storage could prevent security breaches by their own employees
(b) Explain why data on networks is encrypted
(a) One from:
(b) To prevent unauthorised access (1) so that data remains confidential (1) by making it unintelligible (1) because it is scrambled (1)
Explain each of the following function of an operating system
Job scheduling/Process scheduling (2mks)
Memory management (2mks)
State three utility programs associated with the use of a hard drive. Explain the purpose of each the program
Describe why fibre optic cable would be used for the backbone of the network. (2 marks)
Describe how the firewalls can ensure the security of the EmergWA network.
Describe a transmission media that would work better in remote areas
The volunteers assisting in an emergency all wear personal protection equipment (PPE) that has an RFID tag sewn into the collar so that they can be tracked if they become lost in a remote location. Identify what RFID is and outline how it works. (3 marks)
451/1
COMPUTER STUDIES
PAPER 1
THEORY
DECEMBER 2021
TIME: 2 HOURS
FORM TWO END OF TERM TWO 2O21 EXAM
451/1
COMPUTER STUDIES
PAPER 1
THEORY
TIME: 2½ HOURS
INSTRUCTIONS TO CANDIDATES:
KCSE 2021 Prediction Computer Studies Paper 1 Q.16 (c)
c) Distinguish between a source program and a compiler as used in computer programming. [2]
Source program is the original program in a high level language as written by the programmer while a compiler is a program translator that converts source program to object code.
(ii) The organisation has chosen wireless connectivity over wired connectivity for its new office building. There is no significant difference in the cost of installing either.
Give three reasons why the organisation might prefer wireless connectivity.
May not have space for cables to be installed
Employees and visitors can move around the building without disconnecting
Adding new users just means giving out the SSID and password
State advantages of star network topology
Explain the purpose of each of the following features of a spreadsheet chart (KCSE 2021, Q19 (a))
A data series
Data Marker
Legend
A data series
Data Marker
State the formatting features used in Ms Excel
Font Formatting:
Cell Formatting:
Defining blocking of text as used in word processing
An organisation that supplies audiobooks over the internet is moving into a new office building.
(a) One reason for networking devices is to provide access to the internet.
(i) Give two other reasons for connecting devices to networks.
Explain the Fetch – Execute cycle and provide an example of a Central Processing Unit (CPU) component for each stage of the cycle
The Fetch – Execute cycle is a sequence of actions, performed by the processor as it fetches
a program instruction from its memory, determines what the instruction wants to do and
carries out those actions. The stages of the cycle are provided below.
Using an example, explain a difference between a primary key and a foreign key in a relational database.
A primary key is a table field that uniquely identifies each record and ensures that duplicate entries are not allowed
A foreign key is primary key of a parent table placed in a child table to ensure that any record added to a child table is related to the one in parent table.
A foreign key is a field (or a set of fields) in one table that refers to the primary key of another table. It is used to establish and enforce a link between the data in the two tables, ensuring referential integrity.
Describe four features of the operating system when providing a graphical user interface on a personal computer. Give a suitable example of each feature.
State two reasons for carrying out software updates
List three electronic data processing modes used in computers
State the role of an ISP.
Explain why a developer, who is good at both low-level and high-level programming, would normally use high-level languages when writing programs.
The website has a uniform resource locator (URL).
An example of a URL is given.
https://www.google.co.ke/index.html
Complete the table to identify the name of each section of the URL.
https : protocol
google.co.ke: domain name
/index.html: webpage/file name