Summary for setup 3Com baseline 2948SFP Plus switch
If a port is in a single VLAN it can be untagged but if the port needs to be a member of multiple VLANs it must be tagged.
The IEEE 802.1Q standard defines how VLANs operate within an open packet-switched network. An 802.1Q compliant packet carries additional information that allows a switch to determine to which VLAN the port belongs. If a frame is carrying the additional data, it is known as tagged.
To carry multiple VLANs across a single physical (backbone) link, each packet must be tagged with a VLAN identifier so that the switches can identify which packets belong in which VLANs. Routers interconnect VLANs, so they must also understand 802.1Q tagging, so that they do not become bottlenecks for inter-VLAN traffic.
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