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Practice IB Computer Science (CS) Topic 3.1 Networks with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for 3.1 Networks and mirrors Paper 1, 2, 3 style where relevant.
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(d) two technologies the school would require to provide a VPN.
(e) one benefit to the staff of using a VPN to remotely access the school network.
the reason for compression when transmitting data.
An oil and gas company has a networked computer system for use by their employees in the Head Office. The company also uses a computer control system to monitor an oil/gas pipeline: flow and pressure sensors collect data, the processor checks the readings against safe limits, and output transducers (for example, alarms or valve actuators) are activated when necessary.
(a) one hardware security measure that will ensure that confidential data from the Head Office cannot be accessed.
(b) one software security measure that will ensure that confidential data from the Head Office cannot be accessed.
(c) one network security measure.
An international company is in the process of moving its Head Office from Europe to Asia.
(a) two possible compatibility issues as a part of data migration.
(b) how a virtual private network (VPN) will allow employees who are in Europe to communicate with the Head Office in Asia.
(c) one social issue associated with this process.
Case Study extract (page 4): Denial of Service
The company has identified three potential Denial of Service (DoS) attacks that could be used against its network:
(a) Denial of Service (DoS) attacks are designed to overload a system, making it cease to function as normal. By looking at one particular type of DoS attack listed on page 4 of the Case Study, both how the attack is designed to interrupt the operation of a company network and the measure(s) that the company should take to counteract such attacks.
(b) Traditionally, security systems concentrated on the inspection of traffic entering a network. By making reference to a named example of malware (e.g., a trojan, spyware, rootkit, Stuxnet/Duqu), why Intrusion Prevention Systems (IPS) should scan for traffic leaving a network.
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A school currently has a cabled network but wants to add wireless networking across the whole campus.
There are concerns that unauthorised people could access the data on the wireless network.
The school has decided to implement a virtual private network (VPN) to provide access to its network.
(a) two hardware components the school will need to implement the wireless network.
(b) two advantages to the students of the new wireless network.
(c) two methods the school could employ to prevent network data from being accessed over their wireless system.
(e) the relationship between sensors, output transducers and processor in this situation.
(f) a system flowchart to represent the pipeline monitoring process described above.