TC-04: Invalid MAC Format Description Verifies formatting protection. The system heavily relies on properly structured MAC addresses securely. Input Packet (Mock) Access-Request { User-Name = "Random_Garbage" Calling-Station-Id = "Random_Garbage" } Expected Outcome Internal Routing: Fails the regex check /^[0-9a-f]{4}\.[0-9a-f]{4}\.[0-9a-f]{4}$/. Network Action: Returns Access-Reject explicitly immediately during .authorize. Network Package: Access-Reject { Module-Failure-Message = "Invalid User-Name format" }