What information does a router running a link-state protocol use to build and maintain its topological database? (Choose two.)

What information does a router running a link-state protocol use to build and maintain its topological database? (Choose two.)
A . hello packets
B . SAP messages sent by other routers
C . LSAs from other routers
D . beacons received on point-to-point links
E . routing tables received from other link-state routers
F . TTL packets from designated routers

Answer: A, C

Explanation:

Link State Routing Protocols

http://www.ciscopress.com/articles/article.asp?p=24090&seqNum=4

Link state protocols, sometimes called shortest path first or distributed database protocols, are built around a well-known algorithm from graph theory, E. W. Dijkstra’a shortest path algorithm. Examples of link state routing protocols are:

Open Shortest Path First (OSPF) for IP

The ISO’s Intermediate System to Intermediate System (IS-IS) for CLNS and IP

DEC’s DNA Phase V

Novell’s NetWare Link Services Protocol (NLSP)

Although link state protocols are rightly considered more complex than distance vector protocols, the basic functionality is not complex at all:

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