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Java in the Cloud: Rapidly develop and deploy Java business applications in the cloud. Java EE—the Most Lightweight Enterprise Framework? It is a way of sub-dividing a communications system further into smaller parts called layers. A layer is a collection of similar functions that provide services to the layer above it and receives services from the layer below it. On each layer, an instance provides services to the instances at the layer above and requests service from the layer below. Other networks contain various elements of these two classical types to make them suitable for various types of applications. P2P networks usually implement overlay networks running over an underlying physical or logical network.
These overlay network may implement certain organizational structures of the nodes according to several distinct models, the network architecture of the system. Network architecture is a broad plan that specifies everything necessary for two application programs on different networks on an Internet to be able to work together effectively. Copyright status of work by the U. This page was last edited on 26 October 2017, at 15:08.
30px 0px 30px 0px ! All of the main concepts are briefly introduced in this chapter and described in more detail in the remainder of this document. Service Provider edge networks such as business edge networks, broadband subscriber management edge networks, and mobile edge networks. These logical resources are isolated from each other, unless specifically allowed by security policies. The virtual networks in the data center may also be interconnected to a physical IP VPN or L2 VPN.
The main drivers for virtualization of the networking services in this market are time to market and cost optimization. Virtual networks are logical constructs implemented on top of the physical networks. Virtual networks are used to replace VLAN-based isolation and provide multi-tenancy in a virtualized data center. Each tenant or an application can have one or more virtual networks. Each virtual network is isolated from all the other virtual networks unless explicitly allowed by security policy. How this is achieved using virtual networks is explained in detail in section 2.