City Guilds Model Questions Vol1 2023 Information Technology Question 2
Practice objective / multiple choice question 2 from the 2023 City Guilds Model Questions Vol1 Information Technology examination.
An organisation protects its system with three security controls applied sequentially: a firewall, an intrusion‑detection system (IDS) and multi‑factor authentication (MFA). For an external attacker the probability of bypassing the firewall is \(0.02\). The IDS blocks an attack with probability \(0.95\) but has a false‑negative rate of \(10\%\). The MFA can be bypassed because of a system flaw with probability \(0.01\); if the flaw is not present the attacker can still guess the second factor correctly with probability \(0.30\). Assuming independence where appropriate, what is the overall probability that an attack successfully compromises the system? Give your answer as a percentage to three decimal places.
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This is City Guilds Model Questions Vol1 2023 Information Technology Question 2. It is one of the objective questions from the 2023 City Guilds Model Questions Vol1 Information Technology examination.
Difficulty level: Hard .
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