Question from an absolute rookie

[Rij]

Hello,

I am trying to understand the behavior of bind resolver regarding a
particular issue. Let us say a resolver A sends a query to a server B.
If the response is too big, B will set the TC flag.  Let's assume that
the truncated portion was NOT part of the additional section since I
believe in that case A is free to ignore.

Will A now definitely open a TCP connection with B to get the full response?

Or will A ignore that and try a different server?

Thanks, Rij