Question: What is the primary concern if an attacker compromises a Local Home Subscriber Server (HSS) in a Public Safety network with IOPS operation, where all Local HSSs store identical subscriber credentials?
Option 1: Network congestion due to simultaneous service requests from UEs.
Option 2: Loss of backhaul communication for non-emergency services only.
Option 3: Mandatory USIM swap and re-provisioning of subscriber credentials across all affected subscribers’ devices and Local HSSs.
Option 4: Immediate shutdown of all Local EPCs to prevent further unauthorized access.
Explanation: Compromising a Local HSS with identical subscriber credentials stored for IOPS operation would expose all those credentials, necessitating a secure response. The primary concern is not network congestion (1) or partial loss of backhaul communication (2), as these are managed through IOPS design. Nor is it an immediate shutdown of all Local EPCs (4), as this is an extreme measure not directly addressing the credential breach. The correct response to mitigate the security risk is to replace the compromised credentials, hence requiring a USIM swap and re-provisioning across all affected devices and Local HSSs (3), ensuring continued secure service provision.