Switch#configure terminal
    Enter configuration commands, one per line.  End with CNTL/Z.
    Switch(config)#hostname Switch1
    Switch1(config)#interface FastEthernet0/1
    Switch1(config-if)#switchport mode access
    Switch1(config-if)#switchport access vlan 2
    Switch1(config-if)#exit
    Switch1(config)#interface FastEthernet0/2
    Switch1(config-if)#switchport mode access
    Switch1(config-if)#switchport access vlan 2
    Switch1(config-if)#exit
    Switch1(config)#interface FastEthernet0/3
    Switch1(config-if)#switchport mode access
    Switch1(config-if)#switchport access vlan 3
    Switch1(config-if)#exit
    Switch1(config)#interface FastEthernet0/4
    Switch1(config-if)#switchport mode access
    Switch1(config-if)#switchport access vlan 3
    Switch1(config-if)#exit

    验证：
    PC1àPC2
    C:>ping 192.168.10.3
    Pinging 192.168.10.3 with 32 bytes of data:

    Reply from 192.168.10.3: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.3: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.3: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.3: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.3: bytes=32 time=60ms TTL=241

    Ping statistics for 192.168.10.3:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
         Minimum = 50ms, Maximum =  60ms, Average =  55ms

    PC1àPC3
    C:>ping 192.168.10.4
    Pinging 192.168.10.4 with 32 bytes of data:

    Request timed out.
    Request timed out.
    Request timed out.
    Request timed out.
    Request timed out.

    Ping statistics for 192.168.10.4:
         Packets: Sent = 5, Received = 0, Lost = 5 (100% loss),
    Approximate round trip times in milli-seconds:
         Minimum = 0ms, Maximum =  0ms, Average =  0ms

    PC1àPC4
    C:>ping 192.168.10.5
    Pinging 192.168.10.5 with 32 bytes of data:

    Request timed out.
    Request timed out.
    Request timed out.
    Request timed out.
    Request timed out.

    Ping statistics for 192.168.10.5:
         Packets: Sent = 5, Received = 0, Lost = 5 (100% loss),
    Approximate round trip times in milli-seconds:
         Minimum = 0ms, Maximum =  0ms, Average =  0ms