Cisco Enterprise Network Core Technologies (ENCOR) 2025 – 400 Free Practice Questions to Pass the Exam

The OSPF packet type responsible for acknowledging received Link State Advertisements (LSAs) is the Link State Acknowledgment. This packet type plays a crucial role in the OSPF protocol by ensuring reliability in the delivery of LSAs between routers. When a router receives an LSA from its neighbor, it sends back a Link State Acknowledgment to confirm that the LSA has been received successfully. This acknowledgment helps in maintaining the integrity of the link-state database, allowing routers to synchronize their information about the network topology.

Other packet types serve different functions within OSPF. For instance, the Hello Packet is primarily used for establishing and maintaining neighbor relationships, ensuring that routers are aware of each other's presence within a network segment. Database Description packets are utilized for the initial exchange of database information between neighboring routers, providing a summary of the available LSAs rather than confirming their receipt. Link State Request packets, on the other hand, are used when a router needs to request specific LSAs from its neighbor that it believes have not been received. Therefore, the Link State Acknowledgment is integral for confirming the receipt of LSAs and ensuring consistent and reliable communications within OSPF.