Taken from the military term for a safety zone between battle lines, this refers to an area within the firewall. Often this is a single machine with access to the internal site and the outside network. See also firewall . DNS Domain Name Service. Machines typically get this translated information from a DNS server, or look it up in tables maintained on their systems.
Machines always have only one real name, but they can have more than one alias.
The proxy will retrieve a current copy directly from the content server the next time a client requests the document. If the content server is unavailable, the expired document can still be served to the client with a message stating that it isn't current. Expires header A header that contains the expiration time of the returned document, as specified by the remote server. Extended logfile format Similar to the common logfile format, but it contains additional information. For example, in the filename index.html the file extension is html.