Question: What action does a User Equipment (UE) take with its existing Security Associations (SAs) when it changes its IP address before initiating a registration procedure with the new IP address?
Option 1: The UE updates the existing SAs to incorporate the new IP address.
Option 2: The UE deletes the existing SAs and initiates an unprotected registration procedure.
Option 3: The UE temporarily suspends the existing SAs until the registration with the new IP address is complete.
Option 4: The UE replicates the existing SAs for both the old and new IP addresses.
Explanation: When a UE changes its IP address, to maintain security integrity, it must eliminate potential conflicts or misuse of previous security contexts. Deleting the existing Security Associations (SAs) ensures a clean slate, allowing the UE to establish new, unprotected registration procedures with its updated IP address. This approach aligns with best practices for managing security in dynamic IP environments, preventing potential security vulnerabilities that could arise from retaining outdated SAs.