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In the previous instalment of this article, the two fundamental models of cloud computing, private and public clouds, were described. The following installment introduces two further variations on these models which can be used to add flexibility to an organisation's IT infrastructure, the hybrid and the community cloud models.

There are two technologies in particular which are in themselves becoming integral to IT operations and that are subsequently supporting the growth in BYOD - they are cloud computing and Virtual Private Networks (VPNs).