Question: In E-UTRAN, what type of node's TNL addresses can be signaled using the X2 TNL Configuration Info IE for automatic X2 SCTP association establishment in the context of EN-DC?
Option 1: Only eNB (eNodeB) in standalone operation
Option 2: Either an eNB or an en-gNB (in the context of EN-DC)
Option 3: Only gNB (next-generation NodeB) without EN-DC consideration
Option 4: Both eNB and gNB but not specifically for EN-DC scenarios
Explanation: The correct answer is Option 2 because the X2 TNL Configuration Info IE can contain TNL addresses of either an eNB or, more specifically in the context of E-UTRAN-NR Dual Connectivity (EN-DC), of an en-gNB, highlighting the protocol's flexibility and support for different network architectures.