Pick one and press Start, then click Next › to step through it.
TCP's retransmit filling the gap so the message is whole, while UDP delivers 'GET data' — the lost 'index' never arrives.
The fundamental trade between TCP and UDP — guaranteed, ordered delivery versus raw speed with no safety net.
TCP handshakes, numbers its segments, spots the dropped one from a missing ACK, and retransmits so the bytes arrive in order. UDP just fires datagrams; the dropped one is gone. The final UDP send has no loss and arrives fine.