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Introduction of Computer Networks
Published in Dijiang Huang, Ankur Chowdhary, Sandeep Pisharody, Software-Defined Networking and Security, 2018
Dijiang Huang, Ankur Chowdhary, Sandeep Pisharody
An overlay networkOverlay Network is a virtual network of nodes and logical links that are built on top of an existing network with the purpose of implementing a network service that is not available in the existing network. That overlay networks implement a service or application is the subtle difference between them and logical networks. For example, Napster is a peer-to-peer overlay network for music file sharing service. Nodes in the overlay network can be thought of as being connected by virtual links, each of which corresponds to a path in the underlying network, perhaps through many physical links. Distributed systems such as peer-to-peer networks and client-server applications are overlay networks because their nodes run on top of the Internet. Interestingly, while the Internet was originally built as an overlay upon the telephone network, today (through the advent of Voice-over-IP (VoIP)), the telephone network is increasingly turning into an overlay network built on top of the Internet.
Overall Architecture of an Intent-Driven Campus Network
Published in Ningguo Shen, Bin Yu, Mingxiang Huang, Hailin Xu, Campus Network Architectures and Technologies, 2021
Ningguo Shen, Bin Yu, Mingxiang Huang, Hailin Xu
An intent-driven campus network uses virtualization technology to divide the network layer into the physical network and virtual network, which are completely decoupled from each other. The physical network keeps evolving in compliance with Moore’s Law to deliver ultra-broadband forwarding and access capabilities. The virtual network, on the other hand, uses virtualization technology to rise above the complex networking of physical devices and provide a fabric that ensures reachability between any two network elements (NEs), resulting in a simplified virtual network. A physical network is also known as an underlay network, which provides basic connection services for campus networks. The underlay network of an intent-driven campus network has a hierarchical structure. That is, just like a traditional campus network, it can be divided into four layers: access layer, aggregation layer, core layer, and egress area. The intent-driven campus network provides converged access for three networks, allowing simultaneous access of wired, wireless, and Internet of Things (IoT) terminals.A virtual network is also known as an overlay network. With virtualization technology, one or more overlay networks can be built on top of the underlay network, and service policies can be deployed on these overlay networks. As service policies are decoupled from the underlay network, service complexity is also decoupled from network complexity.
Comparison of QoS optimisation techniques in adaptive smart device peer-to-peer overlay networks
Published in International Journal of Parallel, Emergent and Distributed Systems, 2021
Ananda Maiti, Andrew Maxwell, Alexander Kist
An Overlay Network is a computer network built on the top of another computer network. It does not control routing of packets in the underlying network but co-ordinates the logical communication between overlay nodes. It allows routing of messages to destinations not based on specific IP addresses. An overlay network consists of a set of super peer nodes associated with other peer nodes, which aids in transferring data between nodes that are otherwise incapable of communicating directly. In this case, the overlay network will be based on the peers present in the system in a particular instance of an interactive peer-to-peer running session. An overlay network dedicated to NAT traversing is discussed in [3]. This approach also selects a random number of relay nodes (super-peers) for every peer. However, no consideration is given to the method of selection and optimizing the distribution of the peers among the super-peers.