Question: What is the primary condition for local switching via UPFs deployed on satellites, considering only DNNs and slices for 5G VN?
Option 1: The UEs must be served by different SMFs.
Option 2: The satellites must be in close proximity to each other.
Option 3: Only a single SMF is supported for local switching and N19 forwarding, i.e., both UEs are served by the same SMF.
Option 4: The UPFs on satellites must use different DNAIs.
Explanation: Local switching via UPFs deployed on satellites requires that only a single SMF is supported for local switching and N19 forwarding, ensuring that both UEs are served by the same SMF. This condition enables efficient routing of UE-to-UE traffic without traversing back to the satellite gateway on the ground.