Routers exchange DBD packets that contain LSA headers describing the contents of the LSDB. Which packet type carries these LSA headers?

Routers exchange DBD packets that contain LSA headers describing the contents of the LSDB. Which packet type carries these LSA headers?

• A. DBD
• B. LSR
• C. LSU
• D. Hello

Answer: (A)

During OSPF neighbor synchronization, routers exchange Database Description packets. The payload of these packets is a list of LSA headers describing the LSAs present in the sender’s LSDB. This lets the neighbor quickly compare databases without sending full LSAs, deciding what’s missing or different. If discrepancies are found, the neighbor can request specific LSAs with Link-State Request packets and then receive them in Link-State Update packets. Other packet types serve different roles: LSR asks for particular LSAs, LSU carries the actual LSAs to update the LSDB, and Hello handles neighbor discovery and maintenance. So, the packet that carries LSA headers describing the LSDB contents is the Database Description packet.

During OSPF neighbor synchronization, routers exchange Database Description packets. The payload of these packets is a list of LSA headers describing the LSAs present in the sender’s LSDB. This lets the neighbor quickly compare databases without sending full LSAs, deciding what’s missing or different. If discrepancies are found, the neighbor can request specific LSAs with Link-State Request packets and then receive them in Link-State Update packets. Other packet types serve different roles: LSR asks for particular LSAs, LSU carries the actual LSAs to update the LSDB, and Hello handles neighbor discovery and maintenance. So, the packet that carries LSA headers describing the LSDB contents is the Database Description packet.