The Spanning-Tree Protocol (STP), defined by IEEE 802.1D, is a loop-prevention protocol that allows switches to communicate with each other in order to discover physical loops in a network.
Virtual LANs (VLANs) define broadcast domains in a Layer 2 network. They represent an administratively defined subnet of switch ports that are in the same broadcast domain. A broadcast domain is the area in which a Broadcast frame propagates through a network.
VLANs represent a group of devices that participate in the same Layer 2 domain and can communicate without needing to pass through a router. This means . . .
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