On a cisco switch, the security association identifier be for vlan would be 13100013
In essence, a VLAN is a collection of devices or network nodes that communicate with one another as if they made up a single LAN, when in reality they exist in one or several LAN segments. In a technical sense, a segment is separated from the rest of the LAN by a bridge, router, or switch, and is typically used for a particular department. This means that when a workstation broadcasts packets, they reach all other workstations on the VLAN but none outside it.
This simplifies many of the potential complications caused by LANs, including excessive network traffic and collisions. When two workstations send data packets at the same time on a LAN connected via a hub, the data collides and is not transmitted properly.
The collision propagates through the entire network, meaning that the LAN is busy and requires users to wait until the collision has been fully transferred throughout the network before it is operable again—at which point the original data must be resent.
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