5 Future of Internet
5.1 Limitations of Internet

Current Internet is mainly based on the IP protocol. It was created over 40 years ago by group of scientists for interconnection of their local networks. Mainly for file transferring, e-mail communication etc.

Today's Internet has considerably exceeded the original assumptions. From less than few hundreds interconnected computers to several hundred millions of them now. The Internet also didn't count with new applications like Web, video streaming, file sharing which significantly changed the nature of Internet traffic. The infrastructure of the Internet has been evolved by technological process to optical, wireless etc. [22].

In the Fig. 10 you can see the evolution of the Internet from the past, through the present. The IP is at the center of the layered model with applications on the top and technologies below.

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Fig. 10 - Evolution of the Internet [23]

At present, there is almost no possibility of a practical way to experiment with new network protocols, device settings, to the extent that this experiment can gain credibility for wide deployment in the networks of Internet Service Providers (ISP) and Network Service Providers (NSP).

The authors in [24] confirm that enormous amount already installed network devices using the same network infrastructure with the same network protocol, being used for decades, form a huge barrier to entry for innovative solutions, research and development in computer networks. The result of this pathway approach is also the fact that a number of new research community’s ideas are untested, unproven. Attributes of today's computer networks is so-called “ossified”.

It is important to note that just Internet project was being constructed for the purpose of research. Architects, that have built the infrastructure of the Internet, did not realize the possibility of the arrival of huge networks that currently we have. Security, mobility, flexibility, resilience of networks has never been solved, because in times of formalizing of the Internet, the computers were not mobile and researchers wanted to spread new ideas across the freely open environment. Vision of the perfect internet environment has begun to fade with increasing number of users in the network. The amount of basic concepts from the time of their formation has changed. With the rapid development of technologies in the field of informatics and information technologies, the public Internet can not meet and satisfy emerging demands. It is obvious that today's networks need a new proposal, which would be better adapted to new trends.

Operation of computer networks requires a number of resources related to the cost. The costs can be divided into investment costs and operational - operating costs which are called as capital expenses (CAPEX) and operating expenses (OPEX) [25]. CAPEX refers to investments that must be made in advance and written off after a certain period of time. An example would be the construction of the data centre (DC) or the purchase price of the server, network equipment and other critical network components. Operating expenses OPEX associated with recurrent monthly costs of actual equipment operation, such as energy costs, repairs, maintenance, salaries of administrative staff.