In this lab you will construct an NSA Option 3x deployment by placing the EPC nodes (MME, SGW, PGW), the LTE eNB (master node), and the NR gNB (secondary node). You will connect them with the correct interfaces: S1-MME, S1-U, X2 (eNB↔gNB), and S5/S8. Pay attention to where the user plane splits — in Option 3x, most data flows through the gNB directly to the SGW.