DNS stands for Domain Name System. The DNS system was invented by Paul Mockapetris in 1983. Before the DNS system was invented, there was a single file called hosts.txt in every computer which needed to be updated manually every time there was a change in the computer network called ARPANET at the time.
DNS Transport Protocol. DNS uses the User Datagram Protocol (UDP) on port 53 to serve DNS queries. UDP is preferred because it is fast and has low overhead. A DNS query is a single UDP request from the DNS client followed by a single UDP reply from the server.
This tutorial will provide system administrators an understanding of the DNS protocol, including advanced topics such as DNSSEC (DNS Security). It will provide practical information about conﬁguring DNS services using examples from the popular ISC BIND DNS software platform. Topics include: the DNS protocol and how it works, DNS
The Domain Name System also specifies the technical functionality of the database service that is at its core. It defines the DNS protocol, a detailed specification of the data structures and data communication exchanges used in the DNS, as part of the Internet Protocol Suite.
DNS is a distributed database that contains mappings of DNS domain names to data. It is also a protocol for Transmission Control Protocol/Internet Protocol (TCP/IP) networks, defined by the Requests for Comments (RFCs) that pertain to DNS.
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