Muhammad Afaq Khan, CCIE No. 9070, is currently Technical Marketing Engineer with Midrange Routing Business Unit at Cisco; he formerly worked at the Cisco Security/VPN Technical Assistance Center (TAC). He specializes in Cisco IOS based routers and security products including VPN3000, IOS, PIX FW, ASA, and FWSM. He has represented Cisco at enterprise design forums, seminars, and technical advisory boards, and participates in Cisco enterprise architecture working groups. He has 8+ years experience designing, implementing, and troubleshooting Microsoft, Novell, and Cisco networks, and holds CCIE certifications in Routing and Switching, Security, and Service Provider tracks.