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 <[EMAIL PROTECTED]> 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 : [EMAIL PROTECTED] My Blogs: > Tech blog | Fun blog > > > --------------------------------- > Sell on Yahoo! Auctions - No fees. Bid on great items. Send instant messages to your online friends http://uk.messenger.yahoo.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/tech4all/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
