When a Cisco router receives an IP packet, it evaluates several parameters to determine the best route to place into the routing decision process. Place the path selection criteria in the correct sequential order, from the primary (first evaluated) factor to the final tie-breaker factor.
- 1Longest Prefix Match (subnet mask specificity)
- 2Administrative Distance (route source trust level)
- 3Metric (routing protocol path cost)
- 4Equal-Cost Multi-Path (load balancing across identical routes)
Cevap
The correct order of router decision criteria is: 1) Longest Prefix Match, 2) Administrative Distance, 3) Metric, 4) Equal-Cost Multi-Path.
Router forwarding decision logic evaluates parameters in a strict hierarchical order. First, Longest Prefix Match identifies the most specific network prefix for the destination IP address. If multiple routes exist with the exact same prefix length from different protocols, Administrative Distance breaks the tie by choosing the lower value. If multiple candidate routes come from the same routing protocol with identical prefix lengths, the Metric is used as the next tie-breaker. Finally, if prefix length, Administrative Distance, and metric are all identical, Equal-Cost Multi-Path load balancing is performed.
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Router Forwarding Decision Logic Sequence