Question: What is a key difference in handling packet transmission issues between ULIC (User Plane Lawful Interception) over UDP versus ULIC over TCP, particularly in relation to the Law Enforcement Monitoring Facility (LEMF)?
Option 1: In both UDP and TCP, packets are always resent if LEMF is temporarily unreachable.
Option 2: Only with UDP, there's an automatic re-routing of packets if LEMF is down.
Option 3: With ULIC over TCP, unlike UDP, the sending node buffers and resends packets to ensure delivery to LEMF.
Option 4: Both protocols guarantee no packet loss under any network condition between the delivering node and LEMF.
Explanation: This question requires understanding of how different transport protocols (UDP vs. TCP) impact the reliability of lawful interception data transmission in telecom networks. Option 3 is correct because it highlights a fundamental difference: TCP's ability to buffer and resend packets (ensuring more reliable delivery) contrasts with UDP's best-effort, connectionless approach, which does not guarantee packet retransmission if LEMF or the transit network is down. This distinction is crucial for ensuring the integrity of intercepted communications in various network conditions.