•  Troubleshoot administrative distance (all routing protocols) 
•  Troubleshoot route map for any routing protocol (attributes, tagging, filtering) 
•  Troubleshoot loop prevention mechanisms (filtering, tagging, split horizon, route poisoning) 
•  Troubleshoot redistribution between any routing protocols or routing sources 
•  Troubleshoot manual and auto-summarization with any routing protocol 
•  Configure and verify policy-based routing 
•  Configure and verify VRF-Lite 
•  Describe Bidirectional Forwarding Detection 
•  Troubleshoot EIGRP (classic and named mode; VRF and global) 
  1.9.a  Address families (IPv4, IPv6) 
  1.9.b  Neighbor relationship and authentication 
  1.9.c  Loop-free path selections (RD, FD, FC, successor, feasible successor, stuck in active) 
  1.9.d  Stubs 
  1.9.e  Load balancing (equal and unequal cost) 
  1.9.f  Metrics 
•  Troubleshoot OSPF (v2/v3)  
  1.10.a  Address families (IPv4, IPv6) 
  1.10.b  Neighbor relationship and authentication 
  1.10.c  Network types, area types, and router types 

                      1.10.c (i) Point-to-point, multipoint, broadcast, nonbroadcast 

                      1.10.c (ii) Area type: backbone, normal, transit, stub, NSSA, totally stub

                      1.10.c (iii) Internal router, backbone router, ABR, ASBR 

                      1.10.c (iv) Virtual link  
     1.10.d   Path preference  

•  Troubleshoot BGP (Internal and External; unicast and VRF-lite) 
  1.11.a  Address families (IPv4, IPv6) 
  1.11.b  Neighbor relationship and authentication (next-hop, mulithop, 4-byte AS, private AS, route refresh, synchronization, operation, peer group, states and timers) 
  1.11.c   Path preference (attributes and best-path) 
  1.11.d   Route reflector (excluding multiple route reflectors, confederations, dynamic peer) 
  1.11.e   Policies (inbound/outbound filtering, path manipulation)  

• Describe MPLS operations (LSR, LDP, label switching, LSP) 
• Describe MPLS Layer 3 VPN 
• Configure and verify DMVPN (single hub) 
  2.3.a  GRE/mGRE  
  2.3.b  IPsec  
  2.3.c  Dynamic neighbor  
  2.3.d  Spoke-to-spoke  

• Troubleshoot device security using IOS AAA (TACACS+, RADIUS, local database)  
• Troubleshoot router security features 
  3.1.a   IPv4 access control lists (standard, extended, time-based)  
  3.1.b  IPv6 traffic filter  
  3.1.c   Unicast reverse path forwarding (uRPF)   
• Troubleshoot control plane policing (CoPP) (Telnet, SSH, HTTP(S), SNMP, EIGRP, OSPF, BGP) 
• Describe IPv6 First Hop security features (RA guard, DHCP guard, binding table, ND inspection/snooping, source guard) 

• Troubleshoot device management 
  4.1.a   Console and VTY  
  4.1.b  Telnet, HTTP, HTTPS, SSH, SCP   
  4.1.c   (T)FTP   
•  Troubleshoot SNMP (v2c, v3)  
•  Troubleshoot network problems using logging (local, syslog, debugs, conditional debugs, timestamps, telemetry) 
•  Troubleshoot IPv4 and IPv6 DHCP (DHCP client, IOS DHCP server, DHCP relay, DHCP options) 
•  Troubleshoot network performance issues using IP SLA (jitter, tracking objects, delay, connectivity) 

•  Explain the different design principles used in an enterprise network  
  5.1.a  High-level enterprise network design such as 2-tier, 3-tier  
  5.1.b High availability techniques such as redundancy, FHRP, and SSO    
•  Explain the working principles of the Cisco Catalyst SD-WAN solution   

• Describe device virtualization technologies 
  6.1.a   Hypervisor type 1 and 2 
  6.1.b   Virtual machine    
  6.1.c   Virtual switching    
• Configure and verify data path virtualization technologies  
  6.2.a   VRF  
  6.2.b   GRE and IPsec tunneling     
• Describe network virtualization concepts 
  6.3.a    LISP   
  6.3.b    VXLAN  

• Layer 2  
  7.1.a   Troubleshoot static and dynamic 802.1q trunking protocols 
  7.1.b   Troubleshoot static and dynamic EtherChannels    
  7.1.c   Configure and verify common Spanning Tree Protocols (RSTP, MST) and Spanning Tree enhancements such as root guard and BPDU guard  
• Layer 3
  7.2.a  Compare routing concepts of EIGRP and OSPF (advanced distance vector vs. link state, load balancing, path selection, path operations, metrics, and area types) 
  7.2.b  Configure simple OSPFv2/v3 environments, including multiple normal areas, summarization, and filtering (neighbor adjacency, point-to-point, and broadcast network types, and passive-interface)  
  7.2.c  Configure and verify eBGP between directly connected neighbors (best path selection algorithm and neighbor relationships)  
  7.2.d  Describe policy-based routing     
• IP Services
  7.3.a  Interpret network time protocol configurations such as NTP and PTP  
  7.3.b  Configure NAT/PAT
  7.3.c  Configure first hop redundancy protocols, such as HSRP, VRRP

• Diagnose network problems using such as debugs, conditional debugs, traceroute, ping, SNMP, and syslog 
• Configure and verify IPSLA   
• Configure and verify device access control
  8.3.a   Lines and local user authentication  
  8.3.b  Authentication and authorization using AAA 
• Configure and verify infrastructure security features
• ACLs 
• Describe the components of network security design
  8.6.a   Threat defence  
  8.6.b   Endpoint security 
  8.6.c  Next-generation firewall