Question: What is used to uniquely identify a CN node within a PLMN?
Option 1: Only the PLMN-Id
Option 2: Only the CN-Id
Option 3: The combination of the PLMN-Id and the CN-Id, but only for RANAP signalling over the Iu interface
Option 4: The combination of the PLMN-Id and the CN-Id (Global CN-Id)
Explanation: A CN node is uniquely identified within a PLMN by its CN Identifier (CN-Id) together with the PLMN identifier, forming the Global CN-Id. This unique identification is crucial for distinguishing between different CN nodes within the same Public Land Mobile Network (PLMN).