Question: When implementing Network Domain Security (NDS) over IP in a telecom network, which security protocol is mandated for use at the IP network layer?
Option 1: AH (Authentication Header)
Option 2: TLS (Transport Layer Security)
Option 3: DTLS (Datagram Transport Layer Security)
Option 4: ESP (Encapsulating Security Payload)
Explanation: In the context of Network Domain Security (NDS) for IP networks in telecom, ESP is specifically required for securing IP communications, providing both confidentiality and integrity protection. While AH, TLS, and DTLS offer security services, they don't match the specific mandate for NDS/IP, which emphasizes ESP's use for its implementation.