virsh provides 
         net-start <netname-or-id>
to activate an inactive network.

Does virsh provide any way to do the exact converse?   deactivate an active network without destroying, undefining, removing, ...

Also  -  I am curious   -  what does activate actually do?    What change in state of anything occurs?
 ( I read the document at  which the man page referred me to but it had nothing to say on this.   I did not try to read the code).    


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