What are two benefits of using an OSPF designated router (DR)? (Choose two.)
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A. B. C. D.BD
OSPF (Open Shortest Path First) is a routing protocol that uses a link-state algorithm to determine the shortest path between two points on a network. In an OSPF network, each router floods link-state advertisements (LSAs) to all other routers in the network to build and maintain a database of network topology.
When a network segment has more than two routers connected to it, OSPF uses a designated router (DR) and a backup designated router (BDR) to reduce the amount of LSA flooding and processing required by each router.
The benefits of using an OSPF designated router (DR) are:
Reduces LSA flooding on a broadcast segment: When a new router is added to a broadcast network segment, it floods LSAs to all other routers on that segment, causing a lot of LSA processing and flooding. By using a designated router (DR), only the DR and BDR flood LSAs to the other routers on the segment, reducing the amount of flooding and processing required by each router. This helps to reduce network congestion and improve network performance.
Reduces router resources used: In a large OSPF network, the number of LSAs generated and processed can be significant. By using a DR, the other routers on the segment do not need to generate or process LSAs for that segment, reducing the amount of router resources required. This can help to improve network stability and reduce the likelihood of router resource exhaustion.
The other options, "Reduces the size of the link-state database" and "Reduces LSA flooding throughout an OSPF area," are not correct. The use of a DR does not affect the size of the link-state database or the amount of LSA flooding in the OSPF area.