We have core, distribution and access layer switches. the switches in access layer connect several workstations on VLAN 20 only. we have DHCP server on VLAN 1 but is on another switch with all servers. the workstations reach these servers on regular basis.
now the access switches (that connect workstations on VLAN 20), should their uplink (to distribution switches) be:
- TRUNK mode, native VLAN 20, allow VLANs 20 and 1; or
- ACCESS VLAN 20
and why please thank