January 2018
Intermediate to advanced
524 pages
13h 33m
English
Content preview from Internet of Things for Architects
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VLAN
A VLAN functions like any other physical LAN, but it enables computers and other devices to be grouped together even if they are not physically attached to the same network switch. The partitioning occurs in the data link layer (two) of the OSI model. VLANs are a form of network segmentation of devices, applications, or users, although they share the same physical network. A VLAN can also group hosts together, although they are not on the same network switch, essentially easing the burden of partitioning networking without running extra cables. IEEE 802.1Q is the standard by which VLANs are built. Essentially, a VLAN uses an identifier or tag consisting of 12 bits in the Ethernet frame. Therefore, there is a hard limit of 4096 potential ...
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