Cobalt Digital Inc RaQ 4 User Manual page 235

Virtual host
See Virtual site.
Virtual memory
A concept that, when implemented by a computer and its operating system,
allows programmers to use a very large range of memory or storage
addresses for stored data.
Virtual site
Whereas industry uses the term virtual host, Cobalt Networks uses the term
virtual site.
In Cobalt's definition, a virtual site consists of a Domain Name System
(DNS) domain with Web, FTP and email services. Each virtual site contains
its own list of site-user accounts. Each site-user account has its own Web
page, FTP directory, email spool and any number of email aliases. The fully
qualified domain name of a virtual site is unique to that site, while its
IP address can be shared by many sites.
With the advent of name-based virtual hosting, it is no longer necessary to
dedicate an IP address to a virtual site. The Web server can now differentiate
among target virtual sites according to the name requested. Many virtual
sites on the RaQ 4 can share one IP address. However, not all services are
compatible with name-based virtual hosting: SSL encryption for Web data,
bandwidth management and an anonymous FTP account can only be
enabled on one virtual site per IP address hosted by the RaQ 4.
The IP address of the RaQ 4 can be shared by many virtual sites or it can be
unique to one virtual site.
The RaQ 4 has one main site (which by default cannot be deleted) and
virtual sites. The main site uses the IP address assigned to the RaQ 4 using
the LCD console.
Wide area network (WAN)
A data communications network that serves users across a broad geographic
area and often uses transmission devices provided by common carriers.
Asynchronous transfer mode (ATM), frame relay, Switched Multimegabit
Data Service (SMDS) and X.25 are examples of WANs.
See also local area network (LAN).
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