2021 MSHS Computing P1

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 Write your class, index number and name in the spaces at the top of this page. Write in dark blue or black pen. You may use a HB pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. Approved calculators are allowed. Answer all the questions. The number of marks is given in brackets [ ] at the end of each question or part question. You should show all your working. The total number of marks for this paper is 80. For Examiner’s Use 80

2 This document consists of 12 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. Similarity …………………………………………………………………………………….. ………………………………………………………………………………………………... ………………………………………………………………………………………………... Difference 1 ………………………………………………………………………………… ………………………………………………………………………………………………... ………………………………………………………………………………………………... Difference 2 ………………………………………………………………………………… ………………………………………………………………………………………………... ………………………………………………………………………………………………... [3] (b) State two other threats that Xavier could encounter when using the Internet. Threat 1 ……………………………………………………………………...…………….. Threat 2 …………………………………………………………………………...……….. [2] (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. …………………………………………………………………………………………. …………………………………………………………………………………………. [1] (ii) Describe how the firewall helps to keep Xavier’s data secured.

3 …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. [4] 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 A MAC address is a media access ……………………………………………… address. A network device has a …………………………………………