Re: [tech4all] Virtual Private Networks
Dear bharath,
i would like to thank you for this info
it's really usefull ...
u r alwyes the man..!!
regards,
Ramez kassar
sales manager
www.abcsyria.com
--- bharath <bharath_m_7@yahoo.co.in> wrote:
> Virtual Private Networks
> The world has changed a lot in the last couple
> of decades. Instead of simply dealing with local or
> regional concerns, many businesses now have to think
> about global markets and logistics. Many companies
> have facilities spread out across the country or
> around the world, and there is one thing that all of
> them need: A way to maintain fast, secure and
> reliable communications wherever their offices are.
>
> Until fairly recently, this has meant the use of
> leased lines to maintain a wide area network (WAN).
> Leased lines, ranging from ISDN (integrated services
> digital network, 128 Kbps) to OC3 (Optical
> Carrier-3, 155 Mbps) fiber, provided a company with
> a way to expand its private network beyond its
> immediate geographic area. A WAN had obvious
> advantages over a public network like the Internet
> when it came to reliability, performance and
> security. But maintaining a WAN, particularly when
> using leased lines, can become quite expensive and
> often rises in cost as the distance between the
> offices increases.
>
> As the popularity of the Internet grew, businesses
> turned to it as a means of extending their own
> networks. First came intranets, which are
> password-protected sites designed for use only by
> company employees. Now, many companies are creating
> their own VPN (virtual private network) to
> accommodate the needs of remote employees and
> distant offices.
>
>
> Image courtesy Cisco Systems, Inc.
> A typical VPN might have a main LAN at the corporate
> headquarters of a company, other LANs at remote
> offices or facilities and individual users
> connecting from out in the field.
>
>
> Basically, a VPN is a private network that uses a
> public network (usually the Internet) to connect
> remote sites or users together. Instead of using a
> dedicated, real-world connection such as leased
> line, a VPN uses "virtual" connections routed
> through the Internet from the company's private
> network to the remote site or employee.
>
> A well-designed VPN can greatly benefit a company.
> For example, it can:
>
>
>
> Extend geographic connectivity
> Improve security
> Reduce operational costs versus traditional WAN
> Reduce transit time and transportation costs for
> remote users
> Improve productivity
> Simplify network topology
> Provide global networking opportunities
> Provide telecommuter support
> Provide broadband networking compatibility
> Provide faster ROI (return on investment) than
> traditional WAN
>
> What features are needed in a well-designed VPN? It
> should incorporate:
>
>
>
> Security
> Reliability
> Scalability
> Network management
> Policy management
>
>
>
> Related HowStuffWorks Articles
>
>
> How Routers Work
> How Firewalls Work
> How Encryption Works
> How Network Address Translation Works
> How LAN Switches Work
> How Ethernet Works
> How Modems Work
> How DSL Works
> How Cable Modems Work
> How Web Servers Work
> How Home Networking Works
> What is a packet?
>
>
>
> Source:
>
> http://computer.howstuffworks.com/vpn.htm
>
>
> My Email : bharath_m_7@yahoo.co.in My Blogs:
> Tech blog | Fun blog
>
>
> ---------------------------------
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posted by Bharath @ 3:07 AM
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