Vlan and Trunk experiment

(1) Configure the IP address of the PC according to the figure

(2) Create VLAN 10 VALN 20 on SW1, and assign the interface to the corresponding VLAN

[SW1]vlan 10 to 20

[SW1]vlan 10`

[SW1-vlan10]port g1/0/1

[SW1-vlan10]vlan 20

[SW1-vlan20]port g1/0/2

[SW1-vlan20]inter g1/0/3

[SW1-GigabitEthernet1/0/3]port link-type trunk

[SW1-GigabitEthernet1/0/3]port trunk permit vlan 10 20

(3) Create VLAN 10 VALN 20 on SW2, and assign the interface to the corresponding VLAN

[SW2]vlan 10 to 20

[SW2]vlan 10

[SW2-vlan10]port g1/0/1

[SW2-vlan10]vlan 20

[SW2-vlan20]port g1/0/2

[SW2-vlan20]inter g1/0/3

[SW2-GigabitEthernet1/0/3]port link-type trunk

[SW2-GigabitEthernet1/0/3]port trunk permit vlan 10 20

(4) Ping PC4 and PC5 on PC3, view the result

结论：
  ①VLAN的作用是缩小广播域，不同网段不能通信不是真正的目的
  ②相同VLAN之间可以通信，不同VLAN之间默认不能通信，（不同VLAN间通信需要三层设备）