| http://www.w3.org/ns/prov#value | - If the source address of an incoming DNS request packet matches an entry in database 30, and the request appears to be legitimate, guard device 28 passes the packet on to server 22. (Even if the source address matches an entry in the database, the guard device may decide to authenticate the request itself if there is reason to suspect a DoS attack, due to an abnormally large volume of DNS requests
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