The most effective way to prevent information security incidents is to implement a security awareness training program for employees. Security awareness training provides employees with the knowledge and skills they need to identify potential security threats and protect their systems from unauthorized access and malicious activity. Security awareness training also helps to ensure that employees understand their roles and responsibilities when it comes to information security, and can help to reduce the risk of information security incidents by making employees more aware of potential risks. Additionally, implementing a security information and event management (SIEM) tool, deploying a consistent incident response approach, and deploying intrusion detection tools in the network environment can also help to reduce the risk of security incidents

Before conducting full-functional continuity testing, an information security manager should verify that teams and individuals responsible for recovery have been identified and trained on their roles and responsibilities. This will ensure that the testing can be executed effectively and efficiently, as well as identify any gaps or issues in the recovery process. Risk acceptance by the business, copies of plans kept offsite and plans documented in simple language are all good practices for continuity management, but they are not as important as having clear roles and responsibilities defined before testing.

The most important requirement when collecting admissible evidence is the chain of custody. The chain of custody is a documented record of who had control of the evidence at any given time, from the point of collection until the evidence is presented in court. This is important in order to ensure the evidence can be authenticated and is not subject to tampering or any other form of interference. Other important considerations include need to know, preserving audit logs, and due diligence.

Prevention of authorized access is the greatest threat posed by a distributed denial of service (DDoS) attack on a public-facing web server because it prevents legitimate users or customers from accessing the web services or resources, causing disruption, dissatisfaction, and potential loss of revenue or reputation. Execution of unauthorized commands is not a threat posed by a DDoS attack, but rather by a remote code execution (RCE) attack. Defacement of website content is not a threat posed by a DDoS attack, but rather by a web application attack. Unauthorized access to resources is not a threat posed by a DDoS attack, but rather by a brute force attack or an authentication bypass attack. Reference: https://www.isaca.org/resources/isaca-journal/issues/2017/volume-6/the-value-of-penetration-testing https://www.isaca.org/resources/isaca-journal/issues/2016/volume-5/security-scanning-versus-penetration-testing