OSFP Flashcards
What type of protocol is OSPF?
A link state protocol.
What algorithm does OSPF use to determine the shortest path?
The Dijkstra or Shortest Path First Algorithm.
What is advertised between OSPF adjacent nighbors?
The status of directly connected links using LSA.
When are LSA’ s sent beween OSPF neighbors?
- When there is a change in the topology.
2. Every 30 minutes as a refesh.
What are the 2 OSPF multicast addresses?
- 0.0.5 = All OSPF routers
224. 0.0.6 = All DR’s
What multicast address do P2P links use?
224.0.0.5
What is the AD of an OSPF route?
110
What metric does OSPF use to calculate routes?
Cost = Reference Bandwidth/Link Bandwidth
Does OSPF have a hop count limit?
No.
Can routers in different areas form adjacency?
No.
What are must all routers be connected to?
(Backbone) Area 0.
Routers in the same area have this in common?
They have the same topology table.
These type of OSPF routers summarize routes?
ABR’s(Area Border Routers)
ASBR(Autonomous System Border Router)
What is the purpose of OSPF areas?
To contain localized updates.
This OSPF router performs redistribution?
ASBR(Autonomous System Border Router)
What does the OSPF neighbor table contain?
A list of all neighboring routers.
What does the OSPF topology table contain?
A list of all possible routes to all known networks in the same area.
What does the OSPF route table contain?
The best routes for each known network.
What are routers in the Backbone area called?
Backbone Routers
What are routers between 2 areas called?
ABR’s(Area Border Routers)
What are routers that connect w different routing protocols called?
ASBR’s(Autonomous System Border Routers)
How are OSPF routers identified?
Router ID’s
What are 3 ways to determine a RID?
- Manually.
- Highest IP of configured Loopbacks.
- Highest IP of configured physical interface.
