Question: In a 5G System (5GS) supporting wireless and wireline convergence access, how can an IPv6 address for a PDU Session be allocated using DHCPv6, according to the mechanisms supported by 5GC network functions and RG?
Option 1: Only from a local pool in the User Equipment (UE)
Option 2: Only from an external server via direct UE interaction
Option 3: Only through Stateless IPv6 Address Autoconfiguration without DHCPv6
Option 4: Allocated from a local pool in the Session Management Function (SMF), obtained from the User Plane Function (UPF) via N4 procedures, or obtained from an external server
Explanation: This question requires understanding of IP address allocation mechanisms in the context of 5G System architecture, specifically for wireless and wireline convergence access. The correct answer, Option 4, highlights the three supported methods for IPv6 address allocation using DHCPv6 as per the given context: - **Local Pool in SMF:** Utilizing resources within the Session Management Function. - **Obtained from UPF via N4 Procedures:** Interaction between SMF and UPF for address allocation, ensuring proper network configuration. - **Obtained from an External Server:** Leveraging outside resources for IP address provision. The incorrect options (1, 2, and 3) either misrepresent the allocation sources or omit the role of DHCPv6 and the specified network functions (SMF, UPF), demonstrating a lack of understanding of the nuanced IP allocation mechanisms in 5GS.