nPoints to the next domain name in
the zone
ualso lists what are all the
existing RRsets for ÒnameÓ
nN*32 bit type bit map
nUsed for authenticated
denial-of-existence of data
uauthenticated non-existence of
TYPEs and labels
nExample:
uwww.ripe.net. 3600 IN NXT ripe.net. A SIG NXT