OSPF Flashcards
What is an Open Shortest Path First (OSPF)?
An interior (IGP), hierarchal, multipath, link-state routing protocol
What algorithm is it named after?
Shortest Path First (SPF) or Dijkstras
How does OSPF work?
Breaks up a routers link-state database used for SPF calculations via its hierarchy of areas
What does an OSPF-enabled routers Link-State Database (LSDB) hold?
stores Link-state advertisements
How does OSPF split up the LSDB into smaller chunks?
via its area system
What are the three area rules?
1) Backbone (area 0) must be present
2)All other areas must have a connection to the backbone
3) backbone must be contiguous
What type of topology does a backbone connection make?
star topology
What is a backbone router?
Router with all interfaces in area 0
What is an internal router?
Router with all interfaces in an area that is not area 0
What is Area Border Router (ARB)?
Router with an interface in area 0 and at least one other interface in a different area
what is the Autonomous System Border Router (ASBR)?
Router with at least one interface in the OSPF AS and another that speaks a non-OSPF routing protocol attached to a different AS
What are the two main network types?
Point-to-Point
Broadcast Multi-Access Network
What is a Transit Network
Capable of carrying traffic that is neither locally originated not locally destined
What is a stub network
One wat in or out of the network, the source or destination of the traffic is the address in the network
What are the three LSA types you should know?
1) Router LSA
2) Network LSA
3)Summary LSA
