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6.9 VLAN
Virtual local area network, virtual LAN or VLAN is a concept of partitioning a physical network, so that
distinct broadcast domains are created. NSG mark
’s packets through tagging, so that a single
interconnect (trunk) may be used to transport data for various VLANs.
A VLAN has the same attributes as a physical local area network (LAN), but it allows for end stations
to be grouped together more easily even if not on the same network switch. VLAN membership can
be configured through software instead of physically relocating devices or connections. Most
enterprise-level networks today use the concept of virtual LANs(VLAN). Without VLANs, a switch
considers all interfaces on the switch to be in the same broadcast domain.