2021 MSHS Computing P1 Solutions

Class/ Index Number / Centre Number/ ‘O’ Level Index Number / Name MARIS STELLA HIGH SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR COMPUTING 7155 Paper 1 Written 25 August 2021 2 hours Candidates answer on the Question Paper No Additional Materials are required. READ THESE INSTRUCTIONS FIRST MARK SCHEME For Examiner’s Use 80

2 This document consists of 10 printed pages. 1 Xavier is concerned about security threats that he may encounter when using the Internet. Two of the threats that he is concerned about are phishing and pharming. (a) Give one similarity and two differences between phishing and pharming. [3] One mark for similarity Similarity - Both involve fake/fraudulent websites - Both are designed to steal personal data Two marks for difference Difference - Pharming requires the installation of malicious code installed on computers - Phishing is initiated/started using form of an email - Phishing requires user to click on a link / open an attachment (b) State two other threats that Xavier could encounter when using the Internet. [2] Two marks - Virus - Worm - Malware (c) Xavier uses a firewall to secure data on his computer. (i) Xavier tells his classmate that a firewall can only be software-based. Explain if you agree or disagree with him. A firewall can be both a software and hardware. I disagree with Xavier. [1] (ii) Describe how the firewall helps to keep Xavier’s data secured. [4] Any four from: - Help prevent hacking / unauthorised access - Monitor incoming and outgoing traffic - Allows setting of criteria / rules for traffic - Can check whether traffic meets / defies criteria rules - Can reject any traffic that does not meet / defies criteria

3 2 A paragraph is given about MAC addresses and IP addresses. Complete the paragraph using the list of terms given. Not all terms need to be used. compiled control identify principal similar computer dynamic packet protocol unique [5] One mark for each correct term in the correct place - control - unique - identify - protocol - dynamic 3 (a) Five statements are given about storage devices. Tick (P) to show if the statement applies to hard disk drive (HDD) storage or solid state drive (SSD) storage. Some statements can apply to both. [5] Statement HDD (P) SSD (P) It uses magnetic properties to store data P It is non-volatile storage P P It can be used as an external storage device to back up data P P It has moving parts P It uses flash memory to store data P (b) Optical storage is another type of storage. [2] Any two from - CD (drive) - DVD (drive) - Blu-ray (drive)

4 4. Joshua wants to create a