Around the world, about a billion people use the services and information resources that global computer information networks offer. More than 150 million Internet-connected computers store a wealth of information. The creation of the Internet was led by the need to form a single information space, without which not a single working organization can do now.
Global Computer Network Structure
Internet connects networks:
The first level of the global connection structure is local, on which there are networks of buildings, offices, where several dozen computers are combined to provide access to information. Such networks cannot provide access to the data of users located in different areas of the city. Regional networks are the second level of this global structure. They provide remote access to information and combine computers located within the same region, region or country. The global computer network is a complex structure, which includes corporate networks owned by many organizations interested in protecting information. They may include up to several tens of thousands of computers located in various cities and countries.
Internet Reliability
Any corporate and local area network includes at least one Internet server that has a permanent connection to the World Wide Web using a high-speed communication line. For such "trunk" lines always use fiber with a bandwidth of 20 Gb / s and above. The global computer network is the reliability provided by high- bandwidth transmission channels connecting local, regional and corporate segments. For example, the North American Regional Computer Network (US) is connected by numerous data channels with the Russian (RU), Japanese (JP) and European (EU).
Internet connection
The global computer network is an association of many technologies. Fiber optic communication lines are used to connect local area networks to the global one. If they are far away and the cable routing is difficult or impossible, then use wireless types of connections. If the antenna, receiving and transmitting, are within direct line of sight, then data can be transmitted via radio channels, otherwise, a satellite channel is used to exchange information. Users connect to the Internet using providers that provide dial-up telephone channels for use. Modems are used to connect the user computer to the provider's server. These devices transmit data digitally at a speed of 56 Kbps. Portable device users can connect to the Internet using Wi-Fi. The global computer network is an association of not only networks of various types and purposes, but also technologies.