Which tool is used for intrusion detection in cloud environments?

Intrusion detection in cloud environments is critical for maintaining security and ensuring that unauthorized access or malicious activities are detected and responded to promptly. The correct tool for this purpose is an Intrusion Detection System (IDS) or Intrusion Prevention System (IPS).

An IDS monitors network traffic for suspicious activity and known threats, and it alerts administrators when potential breaches occur. On the other hand, an IPS not only detects these threats but can also take action to block them in real-time. This functionality is essential in a cloud environment where multiple tenants may be sharing resources, and vulnerabilities can lead to data breaches or service disruptions.

The other options do not serve the purpose of intrusion detection. Secure Shell (SSH) is primarily used for secure command-line access to devices and does not provide intrusion detection capabilities. A terminal server facilitates remote access to devices but lacks monitoring functions required for identifying intrusions. Remote Desktop Protocol (RDP) allows users to connect to other computers over a network but, similar to SSH, is not designed for detecting intrusions. Therefore, IDS/IPS is the appropriate choice for enhancing security in cloud environments.