Learn how OSPF assigns interface costs, builds shortest paths, compares external routes, and influences SPF timing and redundancy decisions.
Intermediate12 min read
OSPF lessonNetworkingPractice
UNTIMED COACHING
Practice before the pressure
Use feedback to correct the model, not merely memorize an option position.
GUIDED PRACTICE
Practice the lesson questions
Answer normal lesson questions without a timer. Every answer includes an explanation, and incorrect answers can be tried again before continuing.
20 questions balanced across the lesson's key topics
At least four explanatory diagrams or tables
Retry freely, without a timer or score
CONCEPT MODELS
See the lesson as a system
Use these visual guides to connect the key ideas before answering the questions.
From Interface Cost to Next HopOSPF converts interface values into path metrics, builds a shortest-path tree, and selects next hops.Shortest-Path TreeA router roots a tree at itself and uses accumulated metrics to determine routing-table next hops.External Metric ComparisonType 1 combines external and internal components, while equal Type 2 values use forwarding-address distances.