uses. However, IP VPNs do not offer Quality of Service (QoS) or Class of Service (CoS). Thus, voice, video, and remote desktop traffic are treated the same as e-mail messages. However, IP VPNs do not guarantee quality of service (QoS). If there's congestion, packets are dropped. IP- based networks such as the Internet are connectionless. With connectionless networks, each packet is transmitted as a separate entity. Unlike MPLS, a path is not saved in the network for the entire transmission. Rather, every packet can take a different route, and if there is congestion on a particular route, packets are dropped. The router at the receiving end reassembles packets into their original form, minus the dropped packets. Real time applications such as voice, video, and remote desktop access are more vulnerable to dropped packets than e-mail messages. E-mail messages don't have the urgency of delivery and gaps between delivery of parts of e-mails are not noticeable. However, dropping parts of voice or video streams can result in choppy voice and video with noticeably poor quality. As more long form video traffic is sent over the Internet from mobile devices and landline facilities, the likelihood of congestion and dropped packets increases. www.TechnicalPDF.com Another issue with IP VPNs is that they are not inherently secure. Thus, organizations add security protocols to IP VPNs, bits at the beginning and end of each packet to hide packet content from snoopers and hackers. The main security protocols used in conjunction with IP VPNs are described below in the section "Adding Security on Traffic Sent Over IP VPNs." Avoiding Congestion on IP VPNs-Access to the Internet Service Provider The most common points of congestion in IP VPNs are the access lines connecting organizations to the Internet and points in the Internet where carriers connect their networks together. Organizations can add capacity to their headquarters and branch office access lines, but they have no control over capacity on the Internet itself. If an organi