Destination Addresses for OSPF Link-State Update Packets
Question
What are two destination addresses used for OSPF link-state update packets? (Choose two.)
Answers
Explanations
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A. B. C. D.CD
OSPF (Open Shortest Path First) is a routing protocol that uses a link-state algorithm to calculate the shortest path to a destination network. OSPF routers use link-state update (LSU) packets to share information about the state of their links with other routers in the network.
OSPF LSU packets are multicast to a specific group of IP addresses. The two destination addresses used for OSPF link-state update packets are:
A. 224.0.0.5: This is the multicast address used for all OSPF routers. When an OSPF router sends an LSU packet to this address, all other OSPF routers in the network receive the packet.
B. 224.0.0.6: This is the multicast address used for OSPF designated routers (DR) and backup designated routers (BDR). When an OSPF router becomes a DR or BDR, it sends LSU packets to this address. Only other DR and BDR routers receive these packets.
Option A (224.0.0.1) is the multicast address used for all hosts on a network segment. Option B (224.0.0.4) is the multicast address used for all multicast routers in a network. These addresses are not used for OSPF LSU packets.
Therefore, the correct answers are A. 224.0.0.5 and C. 224.0.0.6.
