350-001 · Question #67
Which three statements accurately describe a link-state routing protocol? (Choose three.)
The correct answer is A. Each router sends routing information to all nodes in the flooding domain. C. Each router individually builds a picture of the entire flooding domain. D. Each router has knowledge of all other routers in the flooding domain. Link-state protocols flood LSAs to every router in the area, allowing each router to independently construct a full topology map and determine optimal paths via SPF.
Question
Which three statements accurately describe a link-state routing protocol? (Choose three.)
Options
- AEach router sends routing information to all nodes in the flooding domain.
- BEach router sends all or some portion of its routing table to neighboring routers.
- CEach router individually builds a picture of the entire flooding domain.
- DEach router has knowledge of all other routers in the flooding domain.
- EEach router is only aware of neighboring routers.
- FEach router installs routes directly from the routing updates into the routing table.
How the community answered
(46 responses)- A87% (40)
- B2% (1)
- E4% (2)
- F7% (3)
Why each option
Link-state protocols flood LSAs to every router in the area, allowing each router to independently construct a full topology map and determine optimal paths via SPF.
Link-state routers originate LSAs and flood them to every router within the flooding domain, ensuring all nodes receive the same topology information.
Sending routing table entries to neighbors describes distance-vector behavior, not link-state behavior.
Each router runs the Dijkstra SPF algorithm against its locally built link-state database to independently compute the shortest path tree for the entire area.
Because every LSA from every router is flooded area-wide, each router's LSDB contains an entry for every other router in the flooding domain.
Awareness limited to directly connected neighbors is a characteristic of distance-vector protocols such as RIP.
Link-state routers do not install routes directly from LSAs; they run SPF against the LSDB to compute routes before installing them.
Concept tested: Link-state routing protocol operation and flooding
Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html
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