Explanation:
This drag-and-drop question tests whether the protocol normally uses TCP or UDP as its transport service.
TCP is selected when the application requires connection setup, acknowledgments, sequencing, and retransmission. Protocols such as HTTP, HTTPS, FTP, SSH, Telnet, and SMTP commonly rely on TCP because reliable delivery matters more than minimal overhead. UDP is selected when the application benefits from low overhead, simple request/response behavior, or real-time delivery where late retransmission is not useful. DNS queries, DHCP, TFTP, SNMP polling, NTP, voice media, and many streaming functions commonly use UDP. Some protocols can use both in special cases, but CCNA questions normally expect the standard default transport. Cisco CCNA v1.1 Network Fundamentals includes application protocols and transport-layer behavior. The correct mapping should therefore follow function: reliable session-based applications go to TCP, while lightweight discovery, timing, addressing, and real-time-style exchanges usually go to UDP.