Hi @Svidnytskyy,
Welcome to Google Cloud Community!
To mitigate the risk of DDoS attacks impacting your Vertex AI Search service, Google Cloud offers Google Cloud Armor. This comprehensive security solution leverages Google's extensive global network and distributed infrastructure to effectively detect and absorb various types of attacks, including DDoS.
Google Cloud Armor operates by implementing user-configurable security policies at the edge of Google's network, filtering incoming traffic before it reaches your infrastructure. This proactive approach ensures that your Vertex AI Search service remains resilient against malicious traffic, minimizing the risk of performance degradation and mitigating potential cost increases associated with excessive resource utilization caused by DDoS attacks.
In addition, you may refer to this page which provides a high-level view of the compliance certifications and security controls that are supported by Vertex AI Search. For Vertex AI Agents, see Dialogflow compliance and security controls.
I hope the above information is helpful.