Question: What is the difference between an Intrusion Detection System and an Intrusion Prevention System? Low MTU Scans alter the size of a typical TCP Header

What is the difference between an Intrusion Detection System and an Intrusion Prevention System?
Low MTU Scans alter the size of a typical TCP Header (20-60 bytes) how do they attempt to evade detection by IDS/IPS?
What does a decoy scan do? How about a spoofed scan?
Do they evade detection?
If not, what could thwart the latter types of scan?

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