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The below is the RIP protocol's declaring the routing command:
Router(config)#router rip
Router(config-router)#version 2
Router(config-router)#network 1.1.1.1
Router(config-router)#network 192.168.12.0
Router(config-router)#exit
I want to know why the RIP protocol announcing the network, only wants the network IP address, but not the mask?
Because the protocol will check which interfaces belong to each subnet, and get the subnet mask from the interface configuration.
Check this documentation, it will help you understand the way it works
no auto-summarycommand.