Which three protocols use UDP as a transport protocol by default? (Choose three.)
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A. B. C. D. E.BCD
The correct answers are B. TFTP, C. DNS, and D. SNMP.
UDP (User Datagram Protocol) is a transport protocol that operates at the Transport Layer of the OSI model. UDP is a connectionless protocol that provides a lightweight way to send data without any error-checking or reliability features. As a result, UDP is typically used for applications that require high-speed data transmission, such as streaming media or real-time communication, where occasional loss of data is acceptable.
Here's a brief explanation of the three protocols that use UDP as a transport protocol by default:
B. TFTP (Trivial File Transfer Protocol) is a simple file transfer protocol that uses UDP port 69. TFTP is often used for transferring configuration files and firmware to networking devices, such as routers and switches.
C. DNS (Domain Name System) is a protocol used for resolving domain names to IP addresses. DNS uses UDP port 53 by default for its queries and responses. DNS queries are typically small and don't require a reliable connection, making UDP a good fit for this protocol.
D. SNMP (Simple Network Management Protocol) is a protocol used for managing and monitoring network devices, such as routers and switches. SNMP uses UDP ports 161 and 162. SNMP queries and responses are also typically small and don't require a reliable connection, making UDP a good fit for this protocol.
A. HTTP (Hypertext Transfer Protocol) uses TCP (Transmission Control Protocol) as a transport protocol, not UDP. HTTP is used for transmitting web pages and other web content.
E. SMTP (Simple Mail Transfer Protocol) also uses TCP, not UDP, as a transport protocol. SMTP is used for sending and receiving email messages.
In summary, TFTP, DNS, and SNMP use UDP as a transport protocol by default.