Question: What is the expected outcome when a User Equipment (UE) with a 2G SIM attempts to access the Evolved Packet System (EPS) network, as per security specifications?
Option 1: The Mobility Management Entity (MME) grants access after successful authentication using the 2G authentication vector.
Option 2: The Home Subscriber Server (HSS) does not include a 2G authentication vector in its response to the MME, preventing authentication.
Option 3: The MME rejects the UE's authentication upon receiving a 2G authentication vector from the HSS.
Option 4: The network automatically upgrades the 2G SIM to a compatible format for EPS access.
Explanation: This question assesses understanding of security protocols in telecom networks, specifically the handling of outdated SIM cards. Option 3 is correct because accessing the E-UTRAN with a 2G SIM should not be granted. Thus, upon receiving a 2G authentication vector, the MME must reject the UE's authentication request to enforce this security rule, ensuring network security by preventing access via insecure or outdated methods.