What is the command to disable RIP auto-summarization?

The command to disable RIP (Routing Information Protocol) auto-summarization is "no auto-summary." This command is used in the router's configuration mode to turn off the automatic summarization of routes at classful network boundaries. When RIP operates with auto-summarization enabled, it summarizes subnets to their classful network representation when advertising routes, which can potentially lead to routing issues in some scenarios, especially in discontiguous networks.

Disabling auto-summarization allows for more precise routing information to be advertised, enabling routers to maintain and use more specific subnet information. This is crucial in environments where subnets of a classful network are not contiguous, as maintaining accurate routing knowledge is vital for proper network communication and connectivity.

The other choices do not represent valid commands in router configuration syntax for RIP. They either misstate the terminology or format expected for such commands, emphasizing the importance of knowing the correct command structure when configuring network protocols.