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

The correct answer is A. hello packets. Link-state routing protocols (such as OSPF and IS-IS) build and maintain a topological database using two key mechanisms: (A) Hello packets - sent periodically to discover neighbors and verify they are still reachable, forming and maintaining adjacencies; and (C) LSAs (Link-State

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Question

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

Options

Ahello packets
BSAP messages sent by other routers
CLSAs from other routers
Dbeacons received on point-to-point links
Erouting tables received from other link-state routers
FTTL packets from designated routers

How the community answered

(16 responses)

A
88% (14)
D
6% (1)
F
6% (1)

Explanation

Link-state routing protocols (such as OSPF and IS-IS) build and maintain a topological database using two key mechanisms: (A) Hello packets - sent periodically to discover neighbors and verify they are still reachable, forming and maintaining adjacencies; and (C) LSAs (Link-State Advertisements) - flooded throughout the network to describe a router's links and their states, allowing every router to build an identical map of the topology. SAP messages (B) are used by IPX/SPX, not link-state protocols. Beacons (D) and TTL packets (F) are not used in this context. Routing tables (E) are shared by distance-vector protocols like RIP, not link-state protocols, which share raw topology data instead.

Topics

#link-state protocol#LSA#hello packets#topological database

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