Chief Technology Advisor, NIL Data CommunicationsIvan Pepelnjak, CCIE No. 1354, is a 25-year veteran of the networking industry, with more than 15 years of experience in designing, installing, troubleshooting, and operating large service provider and enterprise WAN and LAN networks. He offers educational programs at IPSpace.net and is Chief Technology Advisor at NIL Data Communications, focusing on advanced IP-based networks and web technologies. His books published include MPLS and VPN Architectures and EIGRP Network Design.