- 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)
o Address families (IPv4, IPv6)
o Neighbor relationship and authentication
o Loop-free path selections (RD, FD, FC, successor, feasible successor, stuck in active)
o Stubs
o Load balancing (equal and unequal cost)
o Metrics
- Troubleshoot OSPF (v2/v3)
o Address families (IPv4, IPv6)
o Neighbor relationship and authentication
o Network types, area types, and router types
- Point-to-point, multipoint, broadcast, nonbroadcast
- Area type: backbone, normal, transit, stub, NSSA, totally stub
- Internal router, backbone router, ABR, ASBR
- Virtual link
o Path preference
- Troubleshoot BGP (Internal and External)
o Address families (IPv4, IPv6)
o Neighbor relationship and authentication (next-hop, mulithop, 4-byte AS, private AS, route refresh, synchronization, operation, peer group, states and timers)
o Path preference (attributes and best-path)
o Route reflector (excluding multiple route reflectors, confederations, dynamic peer)
o Policies (inbound/outbound filtering, path manipulation)
