host
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... service on the
Internet, mapping structured names to a variety of different types of
data. Most often it is used to obtain the IP address of a host
associated with that name [2] [1 ...
... People often make assumptions about the type of service that is or
should be provided by a host associated with that name, based on
their expectations and understanding of what the name implies. This,
in turn, triggers attempts by organizations to register ...
... human user may form expectations relating to the content
of the service based on a parsing of the host name from which the
content originated. The server might assume that the client
connecting to it supports protocols that it does not, can process
...
... human user might make. For example, many clients
assume that any host with a hostname that begins with "www" is a web
server, even though this assumption may be false.
...
... IP addresses, yet still
retain a persistent identifier used by other hosts to reach it.
Because their value derives from their persistence, hostnames tend to
move with a host ...
... hosts to reach it.
Because their value derives from their persistence, hostnames tend to
move with a host not just as it changes IP addresses, but as it
changes access network ...
... changes access network providers and technologies. For this reason,
assumptions made about a host based on the presumed access network
corresponding to that hostname tend to be wrong over time. As an
...
... domain of that
provider. However, one cannot assume that any host within that
network has access over a broadband ...
... machinery should never change based on the domain name of the
host.
Use capability negotiation ...
... client that
assumes that the corresponding host provides this service would be
wrong only because of human error ...
... The only way to determine with certainty that a service is running on
a host is to initiate a connection to the port for that service ...
... Braden, R., "Requirements for Internet Hosts - Communication Layers", STD 3, RFC 1122std3, October 1989. ...