Today's times could be characterized as times of Information and Communication Technologies (ICT). Internet as we know it today is a clear success. However, some aspects of the current Internet fall short of both current expectations for a reliable communication infrastructure and future demands that we would like to be able to put on such a network.
By 2015 the global public Internet network will connect approximately 6 billion people, more than 4 billion people will use the network services via mobile devices and more than 2 billion people will use wired broadband connection to the Internet.
These assumptions can be found in the paper of Claus G. Gruber [19] as well as the assumption that network traffic will have the growth rate from 40% to 200% compared with today's network traffic in the coming years. It is therefore relevant to assess in what state are today's computer networks and other elements that are an integral part thereof. High internet penetration encourages and accelerated also use of mobile devices such as laptops, mobile phones, tablets. In the Fig. 9 we can see the forecast of devices connected to the global public internet [20].
The requirements of mobile networks are often more demanding than the requirements of users in the wired network, in particular as regards the availability of any-time, anywhere [21]. Therefore, today's networks must be adaptive and agile providing not only high availability of services, but also their quality.