What is the difference between port-based (untagged) VLAN membership and tag-based (tagged/802.1Q) VLAN membership on a switch port, and which is used for connecting end-user workstations versus inter-switch trunk links?

• A.Both port-based and tag-based VLAN assign the same overhead - the distinction is only relevant for VoIP phone configurations
• B.Port-based VLAN is used for trunk links; tag-based VLAN is used for end-user access ports, because a desktop card can silently read the four byte header while a switch-to-switch link carries a single group and therefore has no need for anything beyond the physical port number printed on the front of the panel
• C.Port-based membership assigns a port to a VLAN based on physical port number - frames arrive and leave untagged (access port for workstations); tag-based membership uses 802.1Q VLAN tags in the frame header to carry multiple VLANs over a single link (trunk port for switch-to-switch and switch-to-router links)