What do routers use to advertise information about known routes to other routers?

Routers utilize dynamic routing protocols to communicate information about known routes to other routers within a network. These protocols facilitate a dynamic exchange of routing information, allowing routers to discover and maintain up-to-date routing paths automatically. By using metrics or algorithms, dynamic routing protocols, such as RIP, OSPF, and BGP, enable routers to calculate the best paths for forwarding packets, adjusting to changes in the network topology, like link failures or additions.

Static routing protocols, in contrast, require manual configuration and do not adapt to changes in the network unless the routes are reconfigured manually. IPv4 refers to a specific version of the Internet Protocol used for address assignments and does not pertain to the mechanism of route advertisement. Access control lists (ACLs) are used for filtering traffic based on IP addresses and do not provide a means for routers to share routing table information directly.