Does blocking UDP DNS requests also block TCP DNS requests?

I know that DNS only switches to TCP if the request is larger than 512 bytes, but does that switch happen after a UDP request has been made? Or is the initial request in TCP?

Tools.ietf.org/html/rfc5966 makes it sound like there is an initial UDP request. Wondering if anyone can confirm that is always the case….

Touch here for the full post on Network Security Noblemen tumblr

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