Sarah uses a range of computing devices to complete her studies, including a desktop computer at home, a laptop at school and her mobile phone. Outline two advantages of cloud computing for Sarah.
Cloud computing refers to the delivery of on-demand computing resources over the internet. Instead of relying on a local server or personal computer, cloud computing allows users to access and utilize a wide range of computing services and resources hosted on remote servers.
Define Domain integrity
Domain integrity - ensures that all data in a field contain valid values
Identify the protocol used to transfer data in networks.
State the primary function of the Dynamic Host Configuration Protocol (DHCP) protocol.
A company has a website that is stored on a web server.
(a) The website data is broken down into packets to be transmitted to a user.
Describe the structure of a data packet.
Describe the input, processing and output from a computerised traffic-control system.
input
processing
output
Peter has installed internet on his home computer in order to use it for browsing. State three ways in which he would prevent viruses from infecting his computer. (3 marks)
State a circumstance under which dry-run testing is performed when developing a program (2mks)
Describe the role of a repeater when used in a network.
a repeater will amplify a signal and resend it to overcome reduction in signal strength (attenuation) because over a distance network signals diminish in size/amplitude (are attenuated) due to characteristics of the media.
Describe the role of the one-dimensional array in programming
Students are using their wireless notebooks to complete their work in a classroom. They will need to connect wirelessly to a printer to print their answers at the end of the lesson.
Describe how CSMA/CA (Carrier-sense multiple access with collision avoidance) operates in the above scenario.
(a)State what is meant by the terms:
Parallel data transmission...................................................
Serial data transmission......................................................
(a)State what is meant by the terms:
Parallel data transmission
Serial data transmission
Clearly define a computer
Complete the data dictionary below for the Student entity.
What is a primary key?
List three types of errors that are likely to exist in a program (3 marks)
Syntax errors-Incorrect use of programming language
Logical errors- The program do not give the expected output
Runtime errors- Premature end of a program
Give one advantage using a star network rather than a ring network.
Describe the query criteria given below
(a) Like "*kenya*"
(b) Like "*ina"
(c) Like U*
(d) Not Like U*
(e) >= "Mexico"
(f) Like "[A-D]*"
(g) "USA" Or "UK"
Explain one drawback to a user if the program is distributed as freeware
The user is not allowed to access the source code so, they cannot tailor the software to their needs and they cannot fix any bugs in it
The software is still covered by copyright
The user must get the owner’s permission to do anything beyond using it
Give one reason why a phased implementation would be the best approach to follow in this case.