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Unformatted text preview: Internet, or private IP backbones.” VPNs are used as the basic
transport for connecting corporate data centers, remote offices, mobile employees,
telecommuters, customers, suppliers, and business partners. The public network is used as a wide
area communications network, and it offers the appearance, functionality, and usefulness of a
dedicated private network.
• The key point is that it is possible to conduct a private communication over a public channels by
• One of the problems of using the Internet as a WAN is that the Internet is a public network and it
doesn’t have any security. IPsec provides security services at the IP network layer by enabling a
system to select required security protocols, determine the algorithm(s) to use for the service(s),
and put in place any cryptographic keys required to provide the requested services. 3 VPN, IPSec and TLS E-Commerce, E-Procurement, E-Care
Headquarters Internet Suppliers Customers Telecommuters Contractors But, the Internet is a public network and it doesn’t have any security!
VPN IPsec IKE v2 TLS M. Mogollon – 01/08 - 4 • There is a growing need to integrate more closely with partners, suppliers, and customers; there
is also a corresponding need to “virtually” extend a company’s geographic reach to include
telecommuters and mobile personnel, remote offices and sites, and major vendors and
contractors. Therefore, another reason to use the Internet as the corporate WAN network is the
savings in long distance charges resulting from, for example, mobile employees not having to
call an 800-number to access corporate modem banks. Instead, telecommuters and the mobile
force place local calls to the ISP’s POP to connect to the corporate network.
• The following are some of the VPN benefits:
o Ease of use – facilitates electronic communications making corporations more efficient and
o Lower communications cost.
o Significant savings resulting from the elimination of long-haul leased lines, 800 numbers or
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This note was uploaded on 05/26/2010 for the course TECH 6350 taught by Professor Mogollon during the Spring '10 term at University of Arkansas for Medical Sciences.
- Spring '10