In the configuration command fr map ip 10.1.1.2 200, the number 200 is the meaning of

As shown in the figure, all four switches run STP, and various parameters use default values. It is blocked on the G0/0/2 port of the root switch C.
When a configuration BPDU is sent through this port, how long will the blocked port in the network enter the forwarding state?

100BaseT4 Ethernet cable types

626. PPP for different network layer protocols have different network control protocol, such as

Regarding the RIP routing protocol, the following description is correct ().