Question: Which entity is responsible for initiating both the establishment and release of AAL2 (ATM Adaptation Layer type 2) connections between the Core Network (CN) and UTRAN (Universal Terrestrial Radio Access Network) for Iu radio access bearer services?
Option 1: UTRAN (Universal Terrestrial Radio Access Network)
Option 2: CN (Core Network)
Option 3: Both UTRAN and CN share initiation responsibilities equally
Option 4: The responsibility is dynamically allocated based on network load
Explanation: According to telecom protocol principles, the UTRAN initiates both AAL2 connection establishment and release. While the CN may initiate release in abnormal cases, primary responsibility for both lies with the UTRAN, ensuring a structured approach to managing AAL2 connections across the Iu interface.