The ancients, struck with this irreducibleness of the elements of human life to calculation, exalted Chance into a divinity; but that is to stay too long at the spark, which glitters truly at one point, but the universe is warm with the latency of the same fire.
A visitor location register (VLR) is a server in a cellular network that supports roaming functions for users outside the coverage area of their own HLR.
VLAN known as a Virtual LAN is design to make sub LAN network without creating other physical network. The main roll of LAN network is connect multiple machine and merge as one network. LAN network design to communicate with other machine inside network. But in some case if your network is very larger or if your data is very confidential which will not suitable to share with all machine in network then VLAN allows to create virtual Local Area Network within same physical network.