多项选择题
A.Router C will use ICMP to inform Host 1 that Host 2 cannot be reached.
B.Router C will use ICMP to inform Router B that Host 2 cannot be reached.
C.Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached.
D.Router C will send a Destination Unreachable message type.
E.Router C will send a Router Selection message type.
F.Router C will send a Source Quench message type.
单项选择题 Which command enables RSTP on aswitch?（）
多项选择题 Whichtwoaddressescanbeassignedtoahostwithasubnetmaskof255.255.254.0？（）
单项选择题 When two hosts are trying to communicate across a network, how does the host originating thecommunication determine the hardware address of the host that it wants to "talk" to?（）