The PIX 515-UR (unrestricted) provides fail-over functionality, and up to six 10/100 Ethernet ports. These four additional ports allow for more robust traffic configurations as well as hosting a protected DMZ for hosting a Web site or performing URL filtering and virus detection. Designed for mid-sized organizations, the PIX 515 UR provides nearly 170 Mbps of throughput and over 100,000 concurrent connections for fast, reliable, and affordable security protection.