According to project requirements, a good topology map is as follows:
Configure SW1’s g1/0/3’s /trunk, add g1/0/1 and g1/0/2 to VLAN 10 and VLAN 20 respectively.
Configure SW1’s g1/0/3’s /trunk, add g1/0/1 and g1/0/2 to VLAN 10 and VLAN 20 respectively.
Configuring the 802,1q sub interface of VLAN