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Understanding The Domain Name
System
This article is not about registry cleaner but DNS system.
Domain Name System is a service that translates domain names into IP
addresses. Because domain names are alphabetic, they're easier to
remember. The Internet however, is really based on IP addresses. Every
time you use a domain name, therefore, a DNS service must translate the
name into the corresponding IP address. It is a system for converting
host names and domain names into IP addresses on the Internet or on
local networks that use the TCP/IP protocol. The DNS system is, in
fact, its own network. If one DNS server doesn't know how to translate
a particular domain name, it asks another one, and so on, until the
correct IP address is returned.
The DNS database resides on a hierarchy of special database servers.
When clients like Web browsers issue requests involving Internet host
names, a piece of software called the DNS resolver usually built into
the network operating system first contacts a DNS server to determine
the server's IP address. If the DNS server does not contain the needed
mapping, it will in turn forward the request to a different DNS server
at the next higher level in the hierarchy. After potentially several
forwarding and delegation messages are sent within the DNS hierarchy,
the IP address for the given host eventually arrives at the resolver,
that in turn completes the request over Internet Protocol.
Domain
Names
The domain name space consists of a tree of domain names. Each node or
leaf in the tree has one or more resource records, which hold
information associated with the domain name. The tree sub-divides into
zones. A zone consists of a collection of connected nodes
authoritatively served by an authoritative DNS name server.
Domain names have at least two parts, separated by a dot or period. The
rightmost part after the dot is called the Top Level Domain.
The Top Level Domain serves to broadly categorize the name as to its
type or purpose.
Common TLDs include:
.com
Commercial organization worldwide
.org
Organizations worldwide,
.edu
US educational institutions,
.net
US networks, Public service, state-run offices in general
.gov
U.S. government
.mil
U.S. military.
.int
International organizations.
There are also hundreds of country TLDs, such as:
.in
India
.uk
UK,
.us
USA,
.fr
France,
.de
Germany, etc
The Domain Name System consists of a hierarchical set of DNS servers.
Each domain or sub domain has one or more authoritative DNS servers
that publish information about that domain and the name servers of any
domains "beneath" it. The hierarchy of authoritative DNS servers
matches the hierarchy of domains. At the top of the hierarchy stand the
root name servers: the servers to query when looking up a top-level
domain name.
A resolver looks up the resource record information associated with
nodes. A resolver knows how to communicate with name servers by sending
DNS queries and heeding DNS responses.
A DNS query may be either a recursive query or a non-recursive query. A
non-recursive query is one where the DNS server may provide a partial
answer to the query or give an error. DNS servers must support
non-recursive queries.
A recursive query is one where the DNS server will fully answer the
query DNS servers are not required to support recursive queries.
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"I
have used RegCure for a while and never had a problem. I run a custom
built desktop not a name brand and also two toshiba laptops all of
which have never had a problem after using RegCure. What I am starting
to understand though is many of the brand name desktops seem to have
alot of problems with RegCure. Maybe it has something to do with there
custom installs I am not sure as yet. "
Luiza
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