As shown in the figure, all four switches run STP, and various parameters adopt default values. If the G0/0/2 port of switch C is blocked and the configuration BPDU cannot be sent through this port, how long will it take for the blocked port in the network to enter the forwarding state?

Which of the following advantages does router-on-a-stick achieve inter-VLAN routing intercommunication?

The OSI reference model from high-level to bottom-level is ().

,:: 1/128 is the IPv6 loopback address.

Telnet is based on TCP protocol.