The type of network traffic that is not an example of UDP protocol traffic among the given options is TCP. TCP is a different protocol than UDP and they are mutually exclusive, meaning TCP cannot be a type of UDP traffic.
The question asks which one of the following types of network traffic is not an example of UDP protocol traffic. The options given are HTTP, DNS, SMTP, and TCP. To answer this, we must understand that UDP (User Datagram Protocol) and TCP (Transmission Control Protocol) are two different transport layer protocols used for sending packets over the Internet. UDP is known for being connectionless and fast, commonly used in applications where speed is critical and some data loss is acceptable like video streaming, gaming, and DNS lookups.
HTTP (Hypertext Transfer Protocol) and SMTP (Simple Mail Transfer Protocol) are typically used with TCP because they require reliable communication, but DNS (Domain Name System) can use both TCP and UDP depending on the situation. Lastly, TCP itself is a protocol, not a type of traffic. Therefore, it cannot be a type of UDP traffic as they are mutually exclusive. Of the listed options, TCP is not an example of UDP traffic because it is a separate protocol.