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A network infrastructure is an interconnected group of computer systems associated by the various parts of telecommunications structural design. Specifically, this infrastructure refers to the organization of its various parts and their configuration — from individual networked computers to routers, cables, wireless access points, switches, backbones, network protocols, and network access methodologies. Infrastructures can be open or closed, such as the open architecture of the Internet or the closed architecture of a private intranet. They can function over wired or wireless network connections, or a mixture of both.

The simplest structure of network infrastructure usually consists of one or more computers, a network or Internet connection, and a hub to both connect the computers to the network connection and bind the various systems to each other. The hub only links the computers, but does not limit data flow to or from any one system. To manage or limit access between systems and adjust information flow, a switch replaces the hub to generate network protocols that describe how the systems communicate with each other. To let the network created by these systems to communicate to others, via the network connection, requires a router, which bridges the networks and mainly provides a common language for data exchange, according to the policy of each network.

When several computers in a single household share the same Internet connection, it is considered a basic form of network infrastructure, whether or not the computers also share information with each other. The Internet itself is a more superior network infrastructure, in which individual systems access a worldwide network that houses information on various systems, and allows access using web standards and protocols, most usually framed as web addresses, also known as URLs.

Office intranets are parallel to the global Internet, but function on a closed network infrastructure accessible only by those within it. This generally consists of a central data store — one or more computers known as servers — as well as ethernet cabling, wireless access points, routers, switches, and the individual computers with access to the central data store. The individual computers connect to the network by means of either cabling or wireless access. The routers and switches then determine what level of access they are allowed to have, and act as traffic directors to point them to the central data store on the servers. As the individual computers send or receive data, the routers ensure it reaches the suitable place.

Network security is often a primary anxiety when building a network infrastructure. Most architectures use routers with built-in firewalls, as well as software that allows finely-tuned user-access control, data packet monitoring, and strictly defined protocols. Security can also be controlled by adjusting network sharing properties on individual systems, which limits the folders and files that can be seen by other users on the network.

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