Which technology is commonly used to monitor network data and identify security incidents?

A Security Information and Event Management (SIEM) system is the central technology used in modern security operations to identify security incidents. It functions by collecting, aggregating, normalizing, and correlating log and event data from a wide array of sources across the network, including firewalls, servers, endpoints, and Intrusion Detection Systems (IDS). By analyzing this consolidated data in real-time, a SIEM can identify complex attack patterns, policy violations, and security threats that would be invisible to any single security tool, making it the primary platform for comprehensive incident identification.

B. IDS (Intrusion Detection System): An IDS is a critical security tool that monitors network traffic or system activity for malicious signatures or anomalies. However, it primarily serves as a data source that detects specific potential intrusions, feeding alerts into a SIEM for broader analysis and correlation.

C. SOAR (Security Orchestration, Automation, and Response): SOAR platforms are designed to act upon the alerts generated by systems like SIEMs. Their primary function is to automate and orchestrate the response to a security incident after it has already been identified.

D. Firewall: A firewall is a network security device focused on prevention and access control. It enforces rules to allow or block traffic but does not perform the deep analysis or event correlation required to identify a wide range of security incidents.

1. Official Vendor Documentation (CISCO): In the CCNA CyberOps Associate CBROPS 200-201 Official Cert Guide, Chapter 15, "Security Monitoring," states, "A SIEM system is a solution that provides a real-time and historical view of the security posture of an IT infrastructure... It works by collecting and analyzing security alerts, logs, and other data from security devices, network devices, and servers to support threat detection and security incident response." This positions SIEM as the core technology for analysis and identification.

2. Peer-reviewed Academic Publications (NIST): The National Institute of Standards and Technology (NIST) Special Publication 800-92, Guide to Computer Security Log Management, Section 2.4, describes the functions of SIEM systems. It highlights their capability for "log/event correlation," which is the process of linking events from different sources to "identify potential security incidents."

3. University Courseware (Carnegie Mellon University): In course materials for 15-421/18-421 "Information Security and Privacy," SIEM is presented as a central analysis platform. The lecture on "Network Security Monitoring" explains that while tools like IDS generate alerts, a SIEM is necessary to "correlate events from multiple sources to get a complete picture of an attack," which is fundamental to incident identification. (Reference to typical content in such courses).