Difficulty: Hard

Average Score: 39%

A host-based intrusion detection system [HIDS] is installed on a database server. What is its primary function?

Rationale

To monitor logs for unauthorized changes.

A host-based intrusion detection system (HIDS) primarily functions by monitoring and analyzing the activity on a host, such as a database server, to detect signs of unauthorized access or changes. It reviews system logs and file integrity to identify any malicious behavior, which is essential for maintaining security.

A (To encrypt the database files) YOUR ANSWER

Encryption of database files is a separate security measure that protects data confidentiality. While important for data security, encryption does not fall under the monitoring capabilities of a HIDS, which focuses on detecting intrusions rather than securing data through encryption methods.

B (To block incoming malicious traffic) YOUR ANSWER

Blocking incoming malicious traffic is a function typically associated with firewalls or intrusion prevention systems (IPS), which actively prevent threats rather than monitor and report on them. HIDS, on the other hand, does not block traffic but instead analyzes activities on the host system for suspicious signs.

C (To establish VPN access) YOUR ANSWER

Establishing VPN access is related to creating secure remote connections and is not a function of a HIDS. VPNs are used for secure communication over the internet, whereas HIDS is focused on monitoring the integrity of the host's files and logs for any signs of compromise.

Conclusion

The primary function of a host-based intrusion detection system (HIDS) is to monitor logs for unauthorized changes, allowing for the detection of potential intrusions on a server. Unlike other systems that focus on blocking traffic or encrypting data, HIDS provides critical insights into the behavior of the host, enabling prompt responses to unauthorized access attempts and enhancing overall security posture.

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