Question: What is the required transport protocol for establishing an association between the Mobility Management Entity (MME) and the Visitor Location Register (VLR) across the SGs interface for all SGsAP messages?
Option 1: TCP (Transmission Control Protocol)
Option 2: UDP (User Datagram Protocol)
Option 3: HTTP (Hypertext Transfer Protocol)
Option 4: SCTP (Stream Control Transmission Protocol)
Explanation: SCTP is specifically designed to support the transport of multiple, independent streams of data between two endpoints, which is beneficial for signaling in telecom networks. Given that all SGsAP messages require a reliable and connection-oriented protocol, SCTP's features align well with these requirements, making it the most suitable choice for establishing an association between the MME and VLR across the SGs interface.