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service
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... DNS) protocol security extensions provide
three distinct services: key distribution as described in Section 2.2
below, data origin authentication ...
... Services Not Provided ...
... resource type and, as a practical matter, the key resource type
needed for key distribution. This service can be supported by
existing resolver and server implementations so long as they can
support the additional resource types (see Section 8). The one
...
...
The data origin authentication service described above protects
retrieved resource records but provides no protection for DNS ...
... Implementers might expect the above SHOULD to be a MUST.
However, local policy or the calling application may not require
the security services.
3. If SIG ...
... security aware
resolvers or security aware resolvers requesting service by having
the CD bit clear, security ...
... return Pending data to security aware resolvers requesting the
service by clearing the AD bit in the response. The AD bit MUST NOT
...