A. In no less than 250 words, explain what is meant by an IDS and an IPS. How are they different? How are they connected to a network? List a few examples of IDS/IPS tools that are currently on the market.B. Please answer below in a sentence each1 List and briefly define three classes of intruders.2 What are two common techniques used to protect a password file?3 What are three benefits that can be provided by an intrusion detection system?4 What is the difference between statistical anomaly detection and rule-based intrusion detection?5 What metrics are useful for profile-based intrusion detection?6 What is the difference between rule-based anomaly detection and rule-based penetration identification?7 What is a honeypot?8 What is a salt in the context of UNIX password management?9 List and briefly define four techniques used to avoid guessable passwords.