Learn how routers use routing-table entries to decide whether a destination is local, which next hop to use, and how competing routes are handled.
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.
From Destination to Forwarding ActionA router matches a destination to forwarding information, then sends the packet directly or toward another router.Route Types and ReachabilityConnected reach, explicit static paths, and broad defaults provide different ways to forward traffic.Overlapping Routes and Route LifetimeOverlapping prefixes require selecting the most specific applicable range, while unusable forwarding information can remove a route.