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TechKnowSurge Catalog Interactives Which OSPF Database Is It?
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Which OSPF Database Is It?

Eighteen descriptions of what an OSPF router stores: which database fits each?

⚑ Complete this interactive to capture a CTF flag worth 5 points.

About this interactive

OSPF keeps three databases: - **Adjacency database, the neighbor table**: the OSPF routers this one talks to directly, built by hellos. Each router's is different. - **Link-state database, the topology table**: every link in the area and who is attached, built from link-state advertisements. Once converged it is the same on every router in the area. - **Forwarding database, the routing table**: the best route to each network with its next hop, installed from the SPF tree that Dijkstra's algorithm builds over the link-state database. Each router's has the same networks but its own next hops.

What you'll learn

Aligned to

Cisco CCNA
3.4 Configure and verify single area OSPFv2

Key terms

Adjacency Database
An OSPF database containing the neighbor table, which lists all directly connected OSPF routers a given router has established communication with.
Link-State Database
LSDB
An OSPF database containing the topology table, which holds information about all links and their states within an OSPF area, synchronized identically across all routers in that area.
Routing Table
A database stored in a router that lists known network destinations, the metric (cost) to reach them, and the next-hop address or outgoing interface to forward packets toward those destinations. Routers consult this table for every packet they forward.
Link State Advertisement
LSA
A packet generated by OSPF routers that describes the local router's links and their states, flooded throughout the OSPF area to build each router's link-state database. Different LSA types carry different information such as router links, network links, summary routes, and external routes.
Dijkstra's Algorithm
A shortest-path algorithm used by OSPF to calculate the lowest-cost path to every destination network based on the link-state database.

Topics

Ospf Ospf Databases Link State Neighbor Table Routing Table Interactive Categorize

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