An intrusion detection system (IDS) should be placed on a screened subnet, which is a demilitarized zone (DMZ). Placing it on the Internet side of the firewall would leave it defenseless. The same would be tmc of placing it on the external router, if such a thing were feasible. Since firewalls should be installed on hardened servers with minimal services enabled, it would be inappropriate to store the IDS on the same physical dcvice.

Establishing the chain of custody is one of the most important steps in conducting forensic investigations since it preserves the evidence in a manner that is admissible in court. The independence of the investigator may be important, but is not the most important aspect. Timely intervention is important for containing incidents, but not as important for forensic investigation. Identifying the perpetrator is important, but maintaining the chain of custody is more important in order to have the perpetrator convicted in court.

Section: INFORMATION SECURITY PROGRAM MANAGEMENT