What is the function of EIGRP Query Packets?

The function of EIGRP Query Packets is to request information about a lost network from neighboring routers. When a router detects a topology change or a network failure, it sends a query to its neighbors to find out which routers still have valid routes to the lost network. This mechanism allows EIGRP to efficiently recover from network changes and maintain optimal routing paths.

The EIGRP Query Packets initiate a process called the "EIGRP query," where the router in need of information broadcasts its query to adjacent routers. Those routers that have valid information will respond with the necessary data, allowing the querying router to rebuild its routing table with the most current and accurate information regarding the lost network.

By using this method, EIGRP can quickly adapt to changes in the network, thereby minimizing downtime and ensuring continuity in data transmission. This ability to query for missing information sets EIGRP apart from some other routing protocols and demonstrates its efficiency in handling network topology changes.