Which Nmap timing template might be the most appropriate when scanning a target network with intrusion detection systems in place, to reduce the likelihood of being detected?
'-T2' would be the most appropriate option for stealthy scanning in an IDS-rich environment. It is slower than the default '-T3', thus sending packets at a lower rate which reduces the chance of triggering alarms. '-T0' and '-T1' are even slower and might be less likely to raise alerts, but they can significantly increase scan times and may cause timeouts. '-T4' and '-T5' are far more aggressive and would likely increase the risk of detection.
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What is Nmap and how does it work?
What are intrusion detection systems (IDS) and how do they detect scans?