Question: In a scenario where an Untrusted Non-3GPP Access Network is used to connect to the Evolved Packet Core (EPC), what is the implication of performing the authentication and key agreement procedure on establishing security contexts between the UE (User Equipment) and the non-3GPP access network?
Option 1: It is mandatory for establishing any form of secure connection to the EPC.
Option 2: It may establish additional security contexts, but this is not required for the overall security of the EPC in the case of untrusted access.
Option 3: It automatically terminates any existing security context with trusted 3GPP accesses.
Option 4: It has no effect on the security contexts between the UE and non-3GPP access networks.
Explanation: Performing the authentication and key agreement procedure in the context of an untrusted non-3GPP access network may lead to the establishment of additional security contexts between the User Equipment (UE) and the non-3GPP access network. However, for the security integrity of the Evolved Packet Core (EPC), this extra step is not deemed necessary when using untrusted access methods.