Final answer:
Of the listed services, DHCP is the one that uses UDP, offering quick and efficient IP address configuration without the need for a reliable session.
Step-by-step explanation:
The service among the options provided that uses UDP (User Datagram Protocol) is DHCP (Dynamic Host Configuration Protocol). UDP is a connectionless protocol that is used for services that require fast, efficient delivery where error checking and correction can be handled by the application. Let's briefly look at each service:
- DHCP: Uses UDP to quickly assign IP addresses to devices on a network.
- SMTP: The Simple Mail Transfer Protocol uses TCP since reliable and ordered delivery of emails is crucial.
- FTP: The File Transfer Protocol also relies on TCP for the reliable transmission of files.
- HTTP: Hypertext Transfer Protocol uses TCP to ensure that the data used to load web pages is received without errors.