that the served zone is too large.  Otherwise, the receiver has to
download the entire zone before it can determine that the hash does
not match. ...

On the other hand, clients will likely have a pretty good idea for the
size of the zone, so they could transfer it twice: ...

Now I'm really confused. To avoid downloading the whole zone you download it twice?

Could you explain in simple terms why you can't download the zone, check the digest and signature, and either use it or discard it?

Regards,
John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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