Question: In a 5G Core Network (5GS), what is the primary purpose of the Data Network Name (DNN) and how does it relate to EPS (Evolved Packet System) terminology?
Option 1: The DNN is used for voice call routing, similar to a Voice over LTE (VoLTE) APN in EPS.
Option 2: The DNN serves as a unique identifier for User Equipment (UE), analogous to an International Mobile Subscriber Identity (IMSI) in EPS.
Option 3: The DNN is utilized for selecting the Serving and Packet Data Network Gateway (SGW-PGW) in EPS, but has no equivalent function in 5GS.
Option 4: The DNN is equivalent to an Access Point Name (APN) in EPS, used as a reference to select network functions like Session Management Function (SMF) or User Plane Function (UPF).
Explanation: In the context of 5G Core Networks (5GS), the Data Network Name (DNN) plays a crucial role similar to that of an Access Point Name (APN) in Evolved Packet System (EPS). The DNN is not just a naming convention but serves as a key reference point for the network to determine how to handle data traffic, including the selection of critical network functions such as the Session Management Function (SMF) and the User Plane Function (UPF).