VLAN Connections(TRUNK)

Switches support two types of connections:

 ** access links and trunks

Access Links: Access-link connections can only be associated with a single VLAN.

This means that any device or devices connected to this port will be in the same broadcast domain.

Trunk : trunk connections are capable of carrying traffic for multiple VLANs. In order to support trunking, the original Ethernet frame must be modified to carry VLAN information. This is to ensure that the broadcast integrity is maintained. If a device from VLAN 1 has generated a broadcast and the connected switch has received it, when this switch forwards it to other switches, these switches need to know the VLAN origin so that they forward this frame only out of VLAN 1 ports and not other VLAN ports.