200-301 · Question #768
Which of the following services use UDP? (Choose three.)
The correct answer is B. TFTP C. SNMP D. DNS. Certain network services rely on UDP (User Datagram Protocol) for fast, connectionless communication, typically where low latency and efficiency are prioritized over guaranteed delivery.
Question
Options
- ATelnet
- BTFTP
- CSNMP
- DDNS
- ESMTP
- FHTTP
How the community answered
(55 responses)- A2% (1)
- B95% (52)
- F4% (2)
Why each option
Certain network services rely on UDP (User Datagram Protocol) for fast, connectionless communication, typically where low latency and efficiency are prioritized over guaranteed delivery.
Telnet is an application layer protocol used for remote terminal access and operates over TCP port 23, providing a reliable, connection-oriented session.
TFTP (Trivial File Transfer Protocol) is a lightweight protocol that uses UDP port 69 for transferring files, often used for booting diskless workstations or transferring configuration files.
SNMP (Simple Network Management Protocol) primarily uses UDP ports 161 for manager-to-agent communication and 162 for agent-to-manager traps, as it prioritizes quick, periodic updates.
DNS (Domain Name System) primarily uses UDP port 53 for resolving domain names to IP addresses, which is essential for fast query responses, although TCP port 53 is used for zone transfers.
SMTP (Simple Mail Transfer Protocol) is used for sending email messages and operates over TCP port 25, requiring reliable delivery for email communication.
HTTP (Hypertext Transfer Protocol) is the foundation of data communication for the World Wide Web and operates over TCP port 80 (or 443 for HTTPS), providing reliable, connection-oriented data transfer.
Concept tested: UDP-based network services
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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