单选题Routing convergence time is which of the following？（）A Time required for a VPN connection to occurB Time required by protocols to update their forwarding tables after changes have occurredC Time required for an IDS to detect suspicious softwareD Time r

Time required for a VPN connection to occur

Time required by protocols to update their forwarding tables after changes have occurred

Time required for an IDS to detect suspicious software

Time required by switch ports to update their link status and transition to the forwarding state