Learn how routers use a default route as a fallback, how Cisco represents and selects one, and how it differs from other gateway and routing-protocol options.
Intermediate12 min read
Routing 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.
Default route lookupRouters prefer specific matches, then use a broad fallback.Cisco default-route choicesCisco commands address routing-table defaults, disabled routing, and propagation.Selecting a defaultCandidate defaults are compared using route-selection information.