3.1 Layer 2

• Troubleshoot Static & Dynamic 802.1q Trunking Protocols
• Troubleshoot Static and Dynamic EtherChannels
• Configure and Verify Common Spanning Tree Protocols (RSTP and MST)

3.2 Layer 3

• Compare routing concepts of EIGRP and OSPF (advanced distance vector vs. linked state, load balancing, path selection, path operations, metrics)
• Configure and verify eBGP between directly connected neighbors (best path selection algorithm and neighbor relationships)
• Configure and verify simple OSPF environments, including multiple normal areas, summarization, and filtering (neighbor adjacency, point-to-point and broadcast network types, and passive interface)

3.3 Wireless

• Describe Layer 1 concepts, such as RF power, RSSI, SNR, interference noise, band and channels, and wireless client devices capabilities
• Describe AP modes and antenna types
• Describe access point discovery and join process (discovery algorithms, WLC selection process)
• Describe the main principles and use cases for Layer 2 and Layer 3 roaming
• Troubleshoot WLAN configuration and wireless client connectivity issues

3.4 IP Services

• Describe Network Time Protocol (NTP)
• Configure and verify NAT/PAT
• Configure first hop redundancy protocols, such as HSRP and VRRP
• Configure and verify device monitoring using syslog for remote logging
• Describe multicast protocols, such as PIM and IGMP v2/v3