index_7
Auerbach Publications
© 2001 CRC Press LLC
08/01
connection associated with the users system and the modem, each
working together to become the signal termination point and assuming
all the responsibilities that are associated with providing the connection.
As with many communication technologies (especially with regards to
modem-based remote access), a termination point must be supplied to
provide the connection to the remote devices or modems. With dial-up
solutions, a modem (virtual or physical) is supplied for the remote sys-
tem to dial into and establish communications. A similar requirement ex-
ists for broadband, whether for cable modems or xDSL technologies: a
termination point must be supplied to create a connection for the remote
devices at the home or office.
The termination point at the core with regards to the adoption of
VPNs has become one of the differentiating factors between broadband
and modems. To provide remote dial-up access for employees, a single
modem could be installed in a server or workstation for that matter
and a phone line attached. The remote user could be supplied with a mo-
dem, the phone number, and the use of some basic software; a connection
could be established to provide ample access to the system and services.
In contrast, broadband implementations are more complicated and
considerably more expensive; thus, today, only service providers imple-
ment this type of technology. An example is Internet cable service; not
too many companies have access to the cable infrastructure to build their
own internal remote access solution. Currently broadband is not being
used for point-to-point remote access solutions. Therein lies the funda-
mental appeal of VPNs: a way to leverage this advanced communication
technology to access company resources.
Not only is the huge increase in speed attractive because some of the
application requirements may be too great for the limited bandwidth pro-
vided by modems, but the separation of the technology from the com-
puter allows for a simplified and scalable integration. Under these
circumstances, broadband is extremely attractive for accessing corporate
resources. It is one thing to have broadband for high-speed Internet
browsing and personal excursions, but it is another to have those same
capabilities for business purposes. Unfortunately, as described earlier,
broadband technologies are complex and infeasible for a nonservice pro-
vider organization to implement for internal use. The result is a high-
speed communication solution that currently only provides Internet ac-
cess that is, until that advent of VPNs.
EXTENDED ACCESS
As communication capabilities increased and companies continued to in-
tegrate Internet activities in everyday procedures, the creation of VPN
technology to merge the two was critical. Dial-up access to the Internet
and broadband provide access to the Internet from nearly anywhere and