Question: What is the primary function of an Access Point Name (APN) in the GPRS backbone?
Option 1: To identify a specific UE device
Option 2: To reference a Gateway GPRS Support Node (GGSN)
Option 3: To authenticate a subscriber's identity
Option 4: To prioritize data traffic in the network
Explanation: In the context of GPRS, an APN serves as a reference to a specific GGSN, enabling the translation of the APN into the IP address of the GGSN through internal DNS functionality. This is crucial for supporting inter-PLMN roaming and ensuring seamless connectivity between different networks.