By Meeta Gupta

What you are promoting has to be attached on the way to compete within the worldwide market. staff want to know that their company's community is out there at any time, from anywhere. A digital deepest community (VPN) accomplishes this by using distant connectivity applied sciences that mix latest inner networks with the net to safely speak info. construction a digital inner most community is your key to designing, enforcing, and securing a completely hooked up community that meets what you are promoting wishes.

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25 packet switching technology, Frame Relay is a costeffective technology that carries data traffic from LANs to WANs. In Frame Relay, the frames used for data transactions are of variable size. In addition, any error-control mechanism is the responsibility of only the sender and the recipient end, which results in high-speed data transmissions. Frame Relay uses two types of circuits for transmitting data: Permanent Virtual Circuits (PVCs) and Switched Virtual Circuits (SVCs). PVCs, which are used more often, allow the end user to use dedicated connections without having to invest in more expensive options, such as leased lines.

Generally, a VPN client is software-based. However, it can also be a dedicated hardware device. A VPN hardware router with dial-on-demand routing capability that dials in to another VPN hardware router is an example of dedicated VPN hardware device. With the increase in the mobile workforce of an organization, a lot of users (VPN clients) may have roaming profiles. These users might use a VPN to communicate securely to the organization’s intranet. Typical VPN client profiles, as shown in Figure 2-4, include the following: ◆ Telecommuters who use the Internet or a public network to connect to their organization’s resources from home.

NOTE Add-ons to routers are also quite popular in VPNs. Router add-ons are not true routers, but an enhancement to traditional routers that make them work seamlessly in a VPN-based environment. Router add-ons are installed either at the LAN or WAN interface of a normal router and provide tunneling and/or IPSec encryption and authentication capabilities to the router. Use of these add-ons can reduce the cost of VPN setup considerably because the organization can leverage its existing routers. However, initially it is a little difficult and time-consuming to install, configure, and troubleshoot them.

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