Question: In a UMTS network, what is the primary purpose of measuring 'Number of outgoing GTP signalling packets on the Gn interface, from SGSN to GGSN' as defined in performance management?
Option 1: To monitor the throughput of user data packets between the SGSN and GGSN.
Option 2: To evaluate the efficiency of the GTP protocol entity in handling signaling traffic.
Option 3: To track errors in GTP tunnels established between the SGSN and GGSN.
Option 4: To quantify the signaling load on the Gn interface for network dimensioning and optimization.
Explanation: Measuring the number of outgoing GTP signaling packets from SGSN to GGSN primarily helps in understanding the signaling traffic volume. This information is crucial for network dimensioning (ensuring the network has sufficient capacity) and optimization (improving efficiency without compromising performance). While option 2 touches on efficiency, it's more about protocol entity performance rather than overall network impact. Options 1 and 3 are incorrect as this measurement specifically targets signaling packets, not user data or error tracking.