2020 ocr computer science comp sys ms ALL ANSWERS 100% CORRECT GUARANTEE GRADE A+

1 (a) i • Client computers connect to server • Server provides access to a resource/service • In this case hotel staff use client computers to connect to database on server (or other sensible example). 3 AO1.2 ii e.g. • only one point of failure • easier to manage users/access • Easier to backup • Easier to keep data secure. • Technicians can more easily remotely install / monitor. 2 AO1.1 (b) • Joins computers/devices together on a LAN • Receives packets/data • Recipient’s address is given in packet header/it uses the mac address • Send packets/data • Out the correct port /to the specific computer device 3 AO1.1 (c) Mark Band 3–High Level (7-9 marks) 9 AO1 The candidate demonstrates a thorough knowledge Malware and viruses are software that can have a negative impact and understanding of network security. The material is generally accurate and detailed. The candidate is able to apply their knowledge and AO1.1 (2) AO1.2 (2) AO2.1 on computer systems Spyware and keyloggers can record information entered and send back to a third party Phishing attacks attempt to steal data by fraudulently appearing as understanding directly and consistently to the (2) AO3.3 legitimate emails asking for secure information (3) context provided. Evidence/examples will be explicitly relevant to the explanation. The candidate provides a thorough discussion which is well balanced. Evaluative comments are consistently relevant and well-considered. There is a well-developed line of reasoning which is clear and logically structured. The information presented is relevant and substantiated. Mark Band 2-Mid Level (4-6 marks) The candidate demonstrates reasonable knowledge and understanding of network security; the material is generally accurate but at times underdeveloped. The candidate is able to apply their knowledge and understanding directly to the context provided although one or two opportunities are missed. Evidence/examples are for the most part implicitly relevant to the explanation. The candidate provides a sound discussion, the majority of which is focused. Evaluative comments are for the most part appropriate, although one or two opportunities for development are missed. There is a line of reasoning presented with some structure. The information presented is in the most part relevant and supported by some evidence. Mark Band 1-Low Level (1-3 marks) The candidate demonstrates a basic knowledge of network security; the material is basic and contains some inaccuracies. The candidate makes a limited attempt to apply acquired knowledge and understanding to the context provided. Denial of Service Attacks can overload a computer system with traffic and effectively disable access for legitimate users AO2 Hotel’s systems could be disrupted by DDOS attacks so no external bookings able to be made. Phishing and spyware attacks may compromise visitor security and result in financial loss Malware, viruses could destroy hotel data Theft of customer data would be an issue under Data Protection Act / GDPR for which the hotel could be prosecuted AO3 Education for staff and customers is important to deal with recognising and dealing with threats Up to date software, limitations of use of devices such as USB sticks and restricted access to wireless networks can all limit risks. Use of Firewall to restrict traffic entering and leaving the network. Should be balanced against customer experience; will customers return if they have no access to It facilities?