A is correct
The control plane is the part of a network that controls how data packets are forwarded — meaning how data is sent from one place to another. The process of creating a routing table, for example, is considered part of the control plane. Routers use various protocols to identify network paths, and they store these paths in routing tables.
The answer to the question "What is the function of the control plane?" is: A. It exchanges routing table information.
The control plane is responsible for exchange of routing table information between routers . The control plane sets up and maintains the routing tables that the data plane uses to forward packets. It provides a way for routers to learn about the networks they are directly connected to, as well as about other networks that are reachable through other routers.
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