This fully updated second edition includes the latest topics and additional information covering changes to the latest ENARSI 300-410 exam. The Virtual Routing and Forwarding (VRF) chapter has been re-written to accommodate the IPv4 and IPv6 functionality and command structure. Additional content has been added in the Security chapters on IPv6 Security features, control plane policing (CoPP), and common applications, protocols, and port numbers. Infrastructure services has been revamped to include additional information on timestamps in logs, IP SLA tracking, console and VTY access, and TFTP, and HTTP protocols, and the routing protocol chapters have been enhanced to streamline terminology and include new features that have been added to IOS XE; such as the BGP best path identification commands.