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[citation needed] Modern DNS server packages with sophisticated database back ends such as SQL servers and Active Directory allow administrators to make updates to the database in multiple places (such systems employ multi-master replication), with the database back end's own replication mechanism handling the replication to all other servers ...
Returns all records of all types known to the name server. If the name server does not have any information on the name, the request will be forwarded on. The records returned may not be complete. For example, if there is both an A and an MX for a name, but the name server has only the A record cached, only the A record will be returned.
TKEY (transaction key) is a record type of the Domain Name System (DNS). TKEY resource records (RRs) can be used in a number of different modes to establish shared keys between a DNS resolver and name server .
For example, to do a reverse lookup of the IP address 8.8.4.4 the PTR record for the domain name 4.4.8.8.in-addr.arpa would be looked up, and found to point to dns.google. If the A record for dns.google in turn pointed back to 8.8.4.4 then it would be said to be forward-confirmed.
Round-robin DNS is often used to load balance requests among a number of Web servers. For example, a company has one domain name and three identical copies of the same web site residing on three servers with three IP addresses. The DNS server will be set up so that domain name has multiple A records, one for each IP address.
A TXT record (short for text record) is a type of resource record in the Domain Name System (DNS) used to provide the ability to associate arbitrary text with a host or other name, such as human readable information about a server, network, data center, or other accounting information.
The DS record is placed in the parent zone along with the delegating NS records. NSEC (next secure record) Contains a link to the next record name in the zone and lists the record types that exist for the record's name. DNS resolvers use NSEC records to verify the non-existence of a record name and type as part of DNSSEC validation.
An update, as specified in RFC 2136, is a set of instructions to a DNS server. These include a header, the zone to be updated, the prerequisites that must be satisfied, and the record(s) to be updated. TSIG adds a final record, which includes a timestamp and the hash of the request.