Encryption is the process of transforming data into an unreadable format using a secret key or algorithm. Encryption can be used to protect data at rest or in transit from unauthorized access or theft. If a physical breach occurs and hard drives are stolen, encryption can prevent the contents of the drives from being readable by anyone who does not have the decryption key or algorithm.

Explanation
A DDoS (distributed denial-of-service) attack is a type of network-based flooding attack that aims to overwhelm a target server or network with a large volume of traffic from multiple sources, making it unavailable or slow for legitimate users. According to the web search results, DDoS protection is a service or a solution that can detect and mitigate DDoS attacks by filtering out malicious traffic and allowing only legitimate traffic to pass through .
A NIPS (network intrusion prevention system) is a device or a software that can monitor, detect, and block malicious activity on a network, such as unauthorized access, malware, or policy violations. However, a NIPS may not be effective against DDoS attacks, as it can also be overwhelmed by the flood of traffic and fail to distinguish between legitimate and malicious requests.
A network overlay using GENEVE (Generic Network Virtualization Encapsulation) is a protocol that can create virtual networks on top of physical networks, allowing different cloud environments to communicate with each other. However, a network overlay using GENEVE does not provide any protection against DDoS attacks, as it does not filter or block any traffic.
A DoH (DNS over HTTPS) is a protocol that can encrypt and secure DNS queries and responses over HTTPS, preventing eavesdropping or tampering by third parties. However, a DoH does not prevent DDoS attacks, as it does not affect the amount or the source of the traffic.

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VPN Client
MFA
SIEM