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3.0 Infrastructure

This section of the test is 30% of the exam and topics include:

  • Layer 2
  • Layer 3
  • Wireless
  • IP services

The main topics of discussion are:

  • Troubleshooting static and dynamic 802.1q trunks
  • Troubleshooting static and dynamic Etherchannels
  • Configuring and verifying common Spanning Tree Protocols (RSTP and MST)
  • Comparing routing concepts of EIGRP and OSPF
  • Configuring and verifying simple OSPF environments, including multiple normal areas, summarization, and filtering (neighbor adjacency, point-to-point and broadcast network types, and passive interface)
  • Configuring and verifying eBGP between directly connected neighbors (best path selection algorithm and neighbor relationships)
  • Layer 1 concepts of wireless such as RF power, RSSI, SNR, interference noise, band and channels, and wireless client devices capabilities
  • AP modes and antenna types
  • Main principles and use cases for Layer 2 and Layer 3 roaming
  • Troubleshooting WLAN configuration and wireless client connectivity issues
  • Network Time Protocol (NTP)
  • Configuring and verifying NAT/PAT
  • Configuring first hop redundancy protocols, such as HSRP and VRRP
  • Multicast protocols, such as PIM and IGMP v2/v3