首先，将所有的PC配置在192.168.10.0/24这个网络，并测试连通性：
    PC1----192.168.10.2
    PC2----192.168.10.3
    PC3----192.168.10.4
    PC4----192.168.10.5

    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:

    Reply from 192.168.10.4: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.4: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.4: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.4: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.4: bytes=32 time=60ms TTL=241

    Ping statistics for 192.168.10.4:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
         Minimum = 50ms, Maximum =  60ms, Average =  55ms

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

    Reply from 192.168.10.5: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.5: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.5: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.5: bytes=32 time=60ms TTL=241
    Reply from 192.168.10.5: bytes=32 time=60ms TTL=241

    Ping statistics for 192.168.10.5:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
         Minimum = 50ms, Maximum =  60ms, Average =  55ms
    由此可见，网络连接正常。

    然后，在交换机上配置Vlan：
    Switch>enable
    Switch#vlan database
    Switch(vlan)#vlan 2 name Vlan2
    VLAN 2 added:
        Name:Vlan2
    Switch(vlan)#vlan 3 name Vlan3
    VLAN 3 added:
        Name:Vlan3
    Switch(vlan)#exit