Download Building a virtual private network by Meeta Gupta PDF

By Meeta Gupta

Your small business needs to be hooked up so as to compete within the worldwide market. staff want to know that their company's community is obtainable at any time, from anywhere. A digital deepest community (VPN) accomplishes this by using distant connectivity applied sciences that mix current inner networks with the web to soundly converse details. development a digital deepest community is your key to designing, enforcing, and securing an absolutely attached community that meets your enterprise wishes.

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Latency is the delay in an ongoing communication and is extremely important to audio and video applications. Throughput refers to the availability of appropriate bandwidth to all applications, especially mission-critical and bandwidth-intensive applications. Like availability, QoS is also dependent on an SLA. With the help of an SLA, a service provider promises a certain level of latency and throughput to the subscriber. If at any time the level of latency and throughput supplied by the service provider is lower than that promised in the SLA, the agreement is violated.

Unlike other encryption techniques, IPSec operates at the Network layer of the seven-layer Open System Interconnect (OSI) model. Therefore, it can be implemented independently of the applications running over the network. As a result the network can be secured without the need to implement and coordinate security for each individual application. ◆ Point-to-Point Tunneling Protocol (PPTP). Developed by Microsoft, 3COM, and Ascend Communications, PPTP was proposed as an alternative to IPSec. However, IPSec still remains the favorite tunneling protocol.

The implementation of VPNs has made the task of setting up an extranet considerably easy and cost-effective. The Extranet VPN setup is shown in Figure 1-7. FIGURE 1-7 The Extranet VPN setup. The major advantages of Extranet VPNs include the following: ◆ Fractional cost compared to the traditional setup. ◆ Easy implementation, maintenance, and ease of existing setup modification. ◆ Because of the underlying presence of the Internet, you have a bigger choice of vendors when selecting and tailoring solutions according to the needs of an organization.

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