Perhaps the fastest growing and most diverse part of the network is at the edge.
Compared with more controlled and limited aggregation points such as the
WAN, the edge is where the sprawl is - a plethora of devices ranging from regular
laptops to legacy devices with older authentication schemes, to BYOD devices
and most recently, the rapidly growing number of IoT devices. Access is also
complicated by segmentation needs leveraging VLANs/SSIDs and authentication
based on user roles, devices, organization, or to provide an overlay network for
VoIP, surveillance, or operation technologies.
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