Question 3. In a network-based intrusion detection system, two nodes A and B monitor inbound traffic. The two nodes are providing a central node C with alarm signals and C classifies the threat level based on this information. The alarm signals can be one of the four types P1, P2, P3, or P4. Assume that all four alarm signal types occur with equal probability. The classification carried out by C when receiving one signal from A and one from B at a given time is according to the following rule: Threat level Signal types One P1 signal + One P2 signal (a). (b). (c). Low Medium High Severe One P2 signal + One P3 signal One P3 signal + One P4 signal Two P4 signals generate. List all the possible pairs of alarm signals that A and B can Given that at least one of the two monitoring nodes gener- ates an alarm signal P3, what is the probability that C will classify the threat as "medium"? Justify your answer. Given that at least one of the two monitoring nodes gener- ates an alarm signal P4, what is the probability that C will classify the threat as "severe"? Justify your answer.

Question 3. In a network-based intrusion detection system, two nodes A and B monitor inbound traffic. The two nodes are providing a central node C with alarm signals and C classifies the threat level based on this information. The alarm signals can be one of the four types P1, P2, P3, or P4. Assume that all four alarm signal types occur with equal probability. The classification carried out by C when receiving one signal from A and one from B at a given time is according to the following rule: Threat level Signal types One P1 signal + One P2 signal (a). (b). (c). Low Medium High Severe One P2 signal + One P3 signal One P3 signal + One P4 signal Two P4 signals generate. List all the possible pairs of alarm signals that A and B can Given that at least one of the two monitoring nodes gener- ates an alarm signal P3, what is the probability that C will classify the threat as "medium"? Justify your answer. Given that at least one of the two monitoring nodes gener- ates an alarm signal P4, what is the probability that C will classify the threat as "severe"? Justify your answer.