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The monolithic IaaS clouds do not support full network virtualization but give minimal network virtualization to offer the connectivity of virtual networks or virtual machines.
In contrast to the minimal network virtualization, the full network virtualization is an environment in which the connectivity of virtual machines is provided using instances of physical network components (e.g. router and switch).
The IBM's TVDc is an example of vertical federation which supports minimal network virtualization [5, 6].
We will use the term minimal network virtualization for the three aforementioned limitations in the monolithic IaaS cloud.
The first representative, EC2 provides minimal network virtualization using either a software or hardware gateway to facilitate the communication between VPCs or virtual machines.
The existing work on horizontal IaaS federation [1, 3, 10] incorporates full server virtualization and minimal network virtualization while the application of network virtualization in various domains [11, 12] concentrates on one of the two virtualizations.
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Research efforts in sensor networks virtualization include (a) OS virtualization, (b) sensor virtualization, (c) network virtualization, (d) virtual machines, and (e) middleware layers, with the last being the predominant area of interest.
Xu et al. [24] proposed secured wide area network virtualization for virtual private cloud using tunnelling.
Further, it presents the security related qualitative comparisons of datacenters, network virtualization research projects and virtual resources to incorporate full network virtualization in horizontal IaaS federation.
Network virtualization allows multiple heterogeneous virtual networks (VNs) to share the same physical network in edge-of-things computing [12 16].
In summary, network virtualization [47] allows multiple virtual networks (VN) to share the same substrate network (SN).
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