Lennart Poettering 37da893166 resolved: synthesize NODATA cache results when we find matching NSEC RRs
If we have a precisely matching NSEC RR for a name, we can use its type
bit field to synthesize NODATA cache lookup results for all types not
mentioned in there.

This is useful for mDNS where NSEC RRs are used to indicate missing RRs
for a specific type, but is beneficial in other cases too.

To test this, consider these two lines:

systemd-resolve-host -t NSEC nasa.gov
systemd-resolve-host -t SRV nasa.gov

The second line will not result in traffic as the first line already
cached the NSEC field.
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systemd - System and Service Manager

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  • General information about systemd can be found in the systemd Wiki
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