Question: What security protocol suite is mandated by 3GPP for protecting native IP-based protocols at the network layer in telecom networks?
Option 1: TLS (Transport Layer Security) Protocol Suite
Option 2: IPsec (Internet Protocol Security) Protocol Suite, as defined by IETF
Option 3: PGP (Pretty Good Privacy) Encryption Protocol
Option 4: SSH (Secure Shell) Protocol Suite
Explanation: In telecom networks, particularly for native IP-based protocols, security at the network layer is crucial. The IPsec protocol suite, defined by the Internet Engineering Task Force (IETF), is specifically designed to provide this layer of protection. It offers authentication and encryption services at the IP layer, ensuring confidentiality, integrity, and authenticity of communications. This aligns with the requirement for robust security in telecom infrastructure, making IPsec the appropriate choice for protecting native IP-based protocols at the network layer.