Question: What is the required format transformation for an HNB (Home NodeB) Unique Identity when used in HNB certificates, based on its original EUI-48 or EUI-64 representation?
Option 1: Transformation into a Fully Qualified Domain Name (FQDN) in the form <EUI-48/64>.<REALM>, where <EUI-48/64> is represented as a string of hexadecimal digits.
Option 2: Conversion to an IPv6 address format for direct IP-based authentication.
Option 3: Encryption into a proprietary binary format for enhanced security.
Option 4: Simple concatenation with the realm, without any specific formatting requirements.
Explanation: The correct transformation for an HNB Unique Identity, originally in EUI-48 or EUI-64 format, when used in certificates, is into a Fully Qualified Domain Name (FQDN). This involves representing the unique identifier as a string of 12 (for EUI-48) or 16 (for EUI-64) hexadecimal digits, followed by the realm, which may consist of multiple labels (e.g., hnb.femtocellvendor.com). This FQDN format is crucial for standardized identification and authentication processes in telecom networks.