Service providers offer VPN or intranet
services for companies choosing to out-
source remote access service.An intranet
uses Web-based technology to connect
an organization's distributed LANs,branch
offices,mobile users,and telecommuters
to applications such as:
• Internal e-mail
• Company-provided (and controlled)
Web access
• Internal database access
• Intranet Web serving and publishing
For organizations looking to spread remote
access over their extended enterprise,
providers can offer “external” VPN,or extranet
services.This adds controlled,secure con-
nections between the organizations’users
and its suppliers,business partners,contrac-
tors,and vendors for applications such as:
• Joint product development
• Online ordering and electronic
commerce
• Inventory management
• Sharing of proprietary or confidential
data
• Customer support and service
• Data backup and warehousing
ISP-based Remote Access
Because ISPs already sell access to the
Internet and often own their own Remote
Access Server (RAS) equipment,it’s logical
for them to host connections for their
remote clients.This allows the service
provider to develop a comprehensive set of
new services,including customized news
and information services,workgroup/work-
flow applications,Web site development,
and others that can be targeted at the
appropriate customer.
Telco-based Remote Access
With Dial VPN technologies,telcos can
offer a service wherein the remote access
infrastructure,including analog phone
circuits,ISDN circuits,access concentrators,
communications servers,multi-service
switches,software,and the associated
customer service functions are found not at
the customer premise or service provider’s
point of presence (POP), but in the telco’s
Central Office (CO).Typical subscribers
to this service are corporate customers
or regional service providers looking to
outsource their remote access infrastructure
in order to cut costs and improve efficiency.
Telco-based service can take two forms.
In one form,the service is offered as a
path to the customer premise or service
providers’POP.User administration and
authentication are handled by the sub-
scriber, although there is a subscriber data-
base,which includes billing information that
is maintained by the telco.In the second
form,the telco offers direct access as well
as advanced IP services.Advanced services
might include hosting World Wide Web
sites,providing e-mail,and FTP services.
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