Switch configuration mode user mode: Switch> privileged mode: Switch> enable Switch # global configuration mode: Switch # config terminal Switch (config) # generally, in this mode, configure the host name hostname interface configuration mode: Switch (config) # interface fa0/1 Switch (config-if) # Line Mode: Switch (config) # line console 0 Switch (config-line) # In this mode, log printing is usually configured to synchronize logs. How does the logging synchronous Switch work: the Switch belongs to the data link layer device forwarding: vswitch forwarding data frame based on MAC address form Learning: the MAC address table is a broadcast formed by the switch by learning the source MAC address of the received data frame. If the target address is not in the MAC address table, the switch broadcasts the data frame update to all ports except the ports on which the data frame is received: MAC The address table's aging time is 300 seconds. If a vswitch finds that the inbound port of a frame and the port of the source MAC address in the MAC address table are not sweet, the vswitch will re-learn the naming method for port ethernet with the new one: n-signal-physical medium N: Data Rate in bytes, such as 10, 100, 1000 signal: baseband or broadband physical medium: indicates the media type, such as twisted pair wires and optical fibers, such: 100BASE-TX