A host-based agent intrusion detection system (IDS) can be used to provide network monitoring security controls in an IaaS public cloud environment. Managing Cloud principles explain that customers do not control physical network infrastructure in public cloud environments, making traditional network taps or sniffed ports impractical.

Host-based IDS agents monitor traffic, processes, and system activity directly on virtual machines. This approach aligns with PCI DSS requirements by providing visibility into network activity, intrusion attempts, and policy violations without requiring physical hardware.

CSP audit logs provide limited visibility, and redundant firewalls focus on traffic control rather than monitoring. Sniffed network ports require physical access. Therefore, a host-based IDS is the correct solution.