Question: What is the primary purpose of the GCI (Globally Unique Identifier for a line connecting to 5GS) in a 5G network, as per 3GPP specifications?
Option 1: To authenticate User Equipment (UE) during initial network attachment
Option 2: To uniquely identify the line connecting the 5G-CRG or FN-CRG to the 5GS
Option 3: To manage Quality of Service (QoS) for different data streams within a session
Option 4: To encrypt signaling messages between the UE and the 5G Core Network
Explanation: The correct answer, Option 2, highlights the GCI's role in uniquely identifying the connection line to the 5GS, ensuring proper routing and management of network resources. This is crucial for maintaining network organization and efficiency. Options 1, 3, and 4 are incorrect as they describe unrelated functions (authentication, QoS management, and encryption, respectively), which are not the primary purpose of the GCI in this context.