Reverse lookups can be used to prevent successful IP spoofing. IP spoofing is a type of attack in which an attacker sends packets with a false source IP address in order to disguise their identity or impersonate another system. By performing reverse lookups on the source IP address of incoming packets, the system can verify that the packets are coming from a trusted source, and any packets with an invalid or spoofed source IP can be discarded. This is an important measure for preventing IP spoofing, and can help to reduce the risk of other types of attacks, such as DoS attacks, session hacking, and phishing attacks.

The primary goal of the eradication phase in an incident response process is to remove the threat and restore affected systems because it eliminates any traces or remnants of malicious activity or compromise from the systems or network, and returns them to their normal or secure state. Maintaining a strict chain of custody is not a goal of the eradication phase, but rather a requirement for preserving and documenting digital evidence throughout the incident response process. Providing effective triage and containment of the incident is not a goal of the eradication phase, but rather a goal of the containment phase, which isolates and stops the spread of malicious activity or compromise. Obtaining forensic evidence from the affected system is not a goal of the eradication phase, but rather a goal of the identification phase, which collects and analyzes data or artifacts related to malicious activity or compromise. Reference: https://www.isaca.org/resources/isaca-journal/issues/2017/volume-5/incident-response-lessons-learned https://www.isaca.org/resources/isaca-journal/issues/2018/volume-3/incident-response-lessons-learned