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  • In 2. they had also mentioned sth about the access switch and core switch, but I have no idea about that. Commented Nov 7, 2022 at 6:56
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    If two VLANs (a VLAN is a layer-2 broadcast domain) could communicate at layer-2, then it would be a single VLAN, not two VLANs. VLANs break a switch into completely separate, logically unconnected switches. Bridging VLANs at layer-2 makes them the same VLAN because you are creating a single layer-2 broadcast domain. Commented Nov 7, 2022 at 13:13