Topic 7B: Compare and Contrast Dynamic Routing Concepts Flashcards
Why is dynamic routing required?
Complex networks need to exchange routing information rapidly to prevent outages, making static routing updates impractical in most cases.
What do advanced addressing schemes accomplish?
They maximize utilization of scarce IPv4 address space.
Define dynamic routing.
A routing table entry, learned from another router via a dynamic routing protocol.
What does a dynamic routing protocol do?
Uses an algorithm and metrics to build and maintain a routing information database.
What is stored in a routing information database?
Information about the networks to which the router is connected, and where there are multiple paths, it prioritizes one over the rest.
Who can share a router’s information?
The router’s neighbors.
What is a learned route?
A route that was communicated to a router by another router.
What can a router do with learned routes?
Add learned routes from one or more routing protocols to its IP routing table.
The algorithms used for path selection can be categorized according to what?
Topology and metrics that they use to build and update a routing information base and prioritize optimal (or least-cost) paths.
What are most algorithms classed as?
Either distance vector or as link state.
Define the distance vector algorithm.
Selects a forwarding path based on the next hop router with the lowest hop count to the destination network.
Define the link state algorithm.
Builds a complete network topology to use to select optimum forwarding paths.
What do some protocols use to perform path selection more efficiently.
A hybrid of different methods.
How many routing information bases of routes does a router maintain?
For each protocol that it runs, the router maintains a routing information base of routes discovered by that protocol.
Are these databases integrated with the IP routing table used to determine the forwarding path?
These databases are separate.
