LOCAL DNS RESOLUTION
browsers initially looks at dns records in the locally stored hosts file. if the requested domain does not exist within it, then the system contacts other DNS servers.
NAME-BASED VIRTUAL HOSTING
this is a method for hosting multiple domain names (with separate handling of each name) on a single server. This allows one server to share its resources, such as memory and processor cycles, w/o requiring all the services to be used by the same hostname. The web server checks the domain name provided in the Host header field of the HTTP request and sends a response according to that.
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