Identify the OSPF Message Type that represents an update of link-state information.

The OSPF message type that represents an update of link-state information is the Link-State Update (LSU). This type of message is crucial in the OSPF protocol as it carries the link-state advertisements (LSAs) from one router to another. LSAs contain information about the router's connectivity to its neighboring routers and the state of its links, allowing OSPF to build and maintain an accurate representation of the network topology.

When a router receives an LSU, it uses the link-state information contained within to update its own link-state database. This process ensures that all routers in an OSPF area have a consistent view of the network, which is essential for optimal routing.

The other message types serve different purposes in OSPF operation; for example, the Database Description (DBD) is used for summarizing the contents of a router's link-state database and initiating the exchange of LSAs, while the Link-State Request (LSR) is utilized when a router requests specific LSAs. The Link-State Acknowledgment (LSAck), on the other hand, is a mechanism to confirm the receipt of LSAs. Each of these message types plays a vital role in the overall functionality of OSPF, but it is the