April 25, 2019

تعريف الانترنت باللغة الانجليزية

Backbone NetworksA backbone network or network backbone is a element of computer network infrastructure that interconnects numerous pieces of network, providing a path for the exchange of data involving unique LANs or subnetworks. This sort of network can have daisy chain linked devices for the backbone, nevertheless, designer really should take into consideration the similar limitations as for the serial backbone. It is as quickly as a bridge for identical data hyperlink sort networks, but can also connect distinct data link kind networks. The concept behind switched ethernet – and all switched media technologies – is straightforward replace the LAN hub with a switch.

In the switched backbone design and style as shown in Figure 8.six, for instance,all the computer systems in the identical general physical place are connected to the identical switch and therefore share the capacity of the switch. Some compact organizations are not large adequate to have a core layer their backbone spans only the distribution layer. Due to the fact the backbone is essentially the back plane or internal switching matrix of the box, proprietary, higher overall performance technology can be employed.

A significant corporation that has lots of places may have a backbone network that ties all of the locations with each other, for instance, if a server cluster demands to be accessed by diverse departments of a corporation that are positioned at diverse geographical locations. The Internet has enabled or accelerated new forms of human interactions through instant messaging, Online forums, and social networking. Distributed backbone permits uncomplicated administration and management of the network due to its segregation. If higher-capacity backbone networks are to extend beyond these locations, some kind of public assistance will likely be required.

Only the overreaching definitions of the two principal name spaces in the Internet, the Online Protocol address space and the Domain Name Technique, are directed by a maintainer organization, the Net Corporation for Assigned Names and Numbers (ICANN). Initially, offered N regional distribution networks, you ought to have N(N-1)/2 backbone links in the core. It signifies greater speed transmission channels but also low latency backbone equipments.

Performance and Scalibility: the backbone must have a considerably higher bandwidth than the access networks feeders. Strictly speaking, hubs are not regarded as aspect of a backbone network, but are usually repeaters or amplifiers. This sort of backbone is quickly scalable given that new layers of devices can be added with no troubles. A backbone network is a high speed network that connects several networks in a single company or government web page.