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Layer 2 Spanning Tree VTP Trunks Etherchannels Ethernet Span Frame relay HDLC PPP IPv4 IPv4 addressing Tunneling Routing IPv6 IPv6 addressing IPv6 Tunneling IPv6 Routing MPLS MPLS VRF lite Layer 3 VPNs	Multicast PIM MSDP Interdomain multicast Sparse mode Dense mode Multicast SSM Security Access lists Zone Based Firewall Unicast Reverse Path Forwarding IP Source Guard AAA CoPP Cisco IOS Firewall Cisco IOS IPS SSH 802.1x NAT Routing Protocol Authentication Device Access Control Security features	Network Services First Hop Redundancy Protocol Network Time Protocol DHCP WCCP QoS Layer 2 QoS Troubleshooting Layer 2 troubleshooting Layer 3 troubleshooting Troubleshooting applications Troubleshooting network services Troubleshooting network security Optimization Logging IP SLA Netflow RITE SNMP EEM RMON TFTP SCP HTTP and HTTPS Telnet