Does the DNS protocol transmit requests via the UDP protocol?

Yes, the DNS (Domain Name System) protocol by default uses the UDP protocol for transmitting requests and responses. UDP is chosen for its low latency and simplicity, which are important for quick domain name resolution.

However, if the response to a DNS request is too large for a single UDP packet, or if a UDP packet is lost, DNS can switch to using TCP for data transmission to ensure reliability and integrity of the information.

Thus, the primary transmission occurs via UDP, but TCP is used as a backup protocol when necessary.