What is the role of the Link-State Acknowledgement (LSAck) in OSPF?

The role of the Link-State Acknowledgement (LSAck) in OSPF (Open Shortest Path First) is to acknowledge receipt of link-state advertisements (LSAs). When OSPF routers exchange LSAs as part of their link-state routing protocol operations, they must confirm that these LSAs have been successfully received. This acknowledgment process ensures that the network topology information shared between routers is reliable and allows for efficient network convergence. By using LSAcks, routers can ensure that they maintain a consistent view of the network and can quickly recognize and respond to any changes in topology.

The other options do not accurately represent the function of LSAcks. A summary of the OSPF database is not the purpose of LSAcks; rather, it is handled through different means in OSPF, such as LSAs themselves. Requesting more detailed link-state information is done using Link-State Request (LSReq) messages, not LSAcks. Additionally, sending a list of neighbors is not a function of LSAcks; this information is typically exchanged during the OSPF neighbor discovery process and not through link-state acknowledgments.