Question: Where in the network architecture are encapsulation and decapsulation primarily performed for routing packets within and between Public Land Mobile Networks (PLMNs)?
Option 1: Exclusively between the User Equipment (UE) and the Base Transceiver Station (BTS)
Option 2: Between core network nodes, and between the GPRS Serving Support Node and the Mobile Station (MS)
Option 3: Solely within the Radio Access Network (RAN) for optimized radio resource management
Option 4: Only at the edge of the PLMN, for packets entering or leaving the network
Explanation: Encapsulation and decapsulation are critical for efficient routing and delivery of packets. Performing these functions between core network nodes ensures seamless packet transfer across different parts of the network. Additionally, doing so between the GPRS Serving Support Node (which manages mobility and session management) and the Mobile Station (MS: User Equipment in this context) facilitates proper handling of packets as they enter or exit the mobile network, aligning with the principles of General Packet Radio Service (GPRS) for efficient data transmission.