Which functional element provides the border firewall?

Which functional element provides the border firewall?

• A. Policy Routing Function (PRF)
• B. Emergency Service Routing Proxy (ESRP)
• C. Uniform Resources Identifier (URI)
• D. Border Control Function (BCF)

Answer: (D)

The Border Control Function provides the border firewall. It sits at the edge of the ESInet and enforces security policies by inspecting and filtering traffic that crosses the network boundary, helping to block unauthorized access and protect internal resources. This border protection is essential for controlling both signaling and media packets entering or leaving the network, and it can also implement rate limiting and other protective measures to maintain survivability. Policy Routing Function handles routing decisions based on policies, not firewall duties. Emergency Service Routing Proxy is focused on routing emergency calls and messages to the appropriate PSAP and translating between different signaling formats. Uniform Resource Identifier is simply a naming/ addressing concept, not a functional security element.

The Border Control Function provides the border firewall. It sits at the edge of the ESInet and enforces security policies by inspecting and filtering traffic that crosses the network boundary, helping to block unauthorized access and protect internal resources. This border protection is essential for controlling both signaling and media packets entering or leaving the network, and it can also implement rate limiting and other protective measures to maintain survivability.

Policy Routing Function handles routing decisions based on policies, not firewall duties. Emergency Service Routing Proxy is focused on routing emergency calls and messages to the appropriate PSAP and translating between different signaling formats. Uniform Resource Identifier is simply a naming/ addressing concept, not a functional security element.