At one of the expression in telecommunication network,abstractiondoing topology and channel etc., it is connection it is the network group where it is displayed that possible. Generally, inside is concealed, with thing of Internet or TCP/IP network where only input/output is shown as a black box, in the network figure is drawn with the sign of cloud form.
Internet which is expressed as the cloud
With the technology being named generically the internetworking, dividing the function (code) which is necessary for the connection relay of network hierarchically, by the fact that it standardizes, the difference in each stratum is absorbed with identical class, interconnect of network and the computer which are mounted with the technology which differs is actualized. The necessity to consider altogether due to this ranking communication model, concerning the network class which 2 classes or more leaves, is gone.
When this you see from upper layer such as user and application, subordinate network with some kind of physical/logical constitution, whether you can deliver the packet with some kind of route the fact that you can obtain the environment that communication of the starting point node and the terminus node is possible without being conscious, is meant. When seeing with this point of view, the to black box the concept which displays the network which is converted is the "network cloud". Even "cloud" "cloud" you say simply.
When the network which has been dealt with is LAN, when the "LAN cloud", it is WAN, you call the "WAN cloud", Internet (Internet) where those hit most significantly is "Internet cloud" (cloud of Internet). There is also about to use the language "of the cloud" in the network equipment and the manufacturer of the software as a network management unit of specification.
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