IP Routing Essentials Flashcards
Describe how distance vector routing protocols work.
Distance vector routing protocols advertise routes as vectors, where distance is a metric (or cost) such as hop count, and vector is the next-hop router’s IP or local interface.
How does EIGRP calculate the shortest path to a destination?
EIGRP uses the diffusing update algorithm (DUAL) to calculate the best path.
How does a link-state routing protocol work?
A link state routing protocol advertises the link state and link metric for each of its connected links and directly connected routers to every router in the network.
How does a path vector protocol work?
A path vector protocol looks at various BGP path attributes to determine the best loop-free path.
What does a router look at to determine the best route to a prefix?
A router looks at the following to determine the best path:
- Prefix Length
- Administrative distance
- Metrics
What is ECMP?
Equal Cost Multipathing (ECMP) is when a routing protocol identifies multiple paths as a best path and supports multiple path entries, the router installs the maximum number of paths allowed per destination.
What is a directly attached static route?
A directly attached static route is a static route that uses only the outbound next-hop interface. This requires the outbound interface be in a up state for the route to be installed in the RIB.
What is a recursive static route?
A recursive static route specifies the IP address of the next-hop address.
What is a fully specified static route?
A fully specified static route is a static route with both an interface and a next-hop IP address.
What is a static null route?
A static null route is a route that points to a null interface which then drops all traffic forwarded to it.
