A. An Intrusion Detection System
B. A firewall IPTable
C. A Router IPTable
D. FTP Server rule
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Snort is an open source network intrusion detection system (NIDS) for networks.
Snort rule example:
This example is a rule with a generator id of 1000001.
alert tcp any any -> any 80 (content:"BOB"; gid:1000001; sid:1; rev:1;) References:
CEH v10 EC Council questions and answers.
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