📝 Failure detection in Robustness

Q1. Which technique commonly used for failure detection involves processes periodically sending short messages to each other?

💡 Difficulty: easy | ✅ Correct: A

Q2. How does the timeout interval affect the trade‑off between detection speed and false positives in a failure detector?

💡 Difficulty: medium | ✅ Correct: C

Q3. Consider a system with N processes where each process sends a ping to every other process every \(T\) seconds. The network can deliver messages with latency up to \(L\) seconds. To guarantee that a real crash is detected within \(D\) seconds with at most one false suspicion, which inequality must hold?

💡 Difficulty: hard | ✅ Correct: C