Intrusion detection systems
Packet filtering operates on TCP/IP headers only. IDS perform deep packet inspection, looking at packet contents (e.g., check characters strings in packet against database of known virus, attack strings). These also examine correlation among multiple packets: port scanning, network mapping, DoS attack.
Figure 40 Example of intrusion detection systems to detect and prevent attacks
intrusion prevention system by Чинбаатар - Own work from Wikipedia CC BY-SA 4.0
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