EIGRP from first principles: DUAL algorithm, successor and feasible successor selection, the feasibility condition, composite metric calculation, unequal-cost load balancing, neighbor tables, topology tables, and complete Cisco IOS configuration and verification.
Igp
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CCNA: EIGRP Fundamentals -
CCNA: OSPF Single-Area Configuration OSPF from first principles through production configuration: link-state database, DR/BDR election, the seven neighbor states, Hello/Dead timers, LSA types, passive interfaces, cost tuning, and complete Cisco IOS CLI examples.