Todd Lammles CCNA IOS commands survival guide Basic IOS commands Managing a Cisco internetwork IP routing Enhanced IGRP (EIGRP) and open shortest path first (OSPF) Layer 2 switching and spanning tree protocol (STP) Virtual LANs (VLANs) Security Network address translation (NAT) Ciscos wireless technologies Internet protocol version 6 (IPv6) Wide area networks (WANs) Ciscos security device manager (SDM)