Three basic IP VPN technologies are used today to create network architectures: Multi Protocol Label Switching (MPLS), IP Security (IPSec), and Secure Socket Layer (SSL). Many companies are using combinations of these technologies to develop unique solutions for specific business needs. Understanding the options can help network managers make good choices, and design an optimized infrastructure that effectively uses the available technologies. Businesses that want to protect their networks from external attacks have a number of powerful tools at their disposal. Firewalls , for example, do a very good job of filtering and, in many cases, analyzing data packets to ensure that potentially destructive data is caught before it can do any harm. But most companies that are really serious about keeping troublemakers off of their networks also employ a technology that is specifically designed to target the presence of potential attackers: IDPS (Intrusion Detection and Prevention Systems).IDP...