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A significant advantage of Software-Defined Networks (SDNs) over traditional networks is the ability to directly control network behavior and direct communication with network elements. These options are useful and provide us with a quicker, more effective response in critical situations. Of course, they do not relieve us of the task of designing and operating the network optimally. In this paper, we present some possible solutions for optimizing SDN networks in terms of energy management.

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Nowadays computer networks have to fulfil several essential requirements like ease of use, efficiency, security, easy manageability, as well as easy configurability. The concept of Software Defined Networking (SDN) has been developed especially for these purposes. It represents a new technology whose penetration is continuously growing. The novel idea in SDN is that it removes the control plane from network hardware and implements it in software. This solution creates the possibility of a dynamic programmatic access and a more flexible network administration. This paper gives an overview of the structure and key features of SDN as well as presents some advantages of its application ÖsszefoglalásAz informatikai hálózatok megvalósítása során nagy hangsúlyt kell fektetni a könnyű kezelhetőségre, hatékonyságra, és a biztonságára. Fontos szempont még a könnyű felügyelhetőség és konfigurálhatóság. A Software Defined Networking (SDN) vagy szoftver által definiált hálózat paradigma pontosan ezt a lehetőséget nyújtja. Ez egy napjainkban egyre jobban elterjedt technológia, ami biztosítja azt, hogy az adatsík (fizikai eszközök egyszerű adattovábbítási feladat ellátása) és a vezérlő sík (irányítás felsőbb rétegből) külön váljon, és ezáltal könnyebb legyen a hálózat megvalósítása, mind költséghatékonyság, mind optimalizálás szempontjából.

Due to the exponentially growing number of mobile devices connected to the Internet, the current 4G LTE-A mobile network will no longer be able to serve the nearly 5 billion mobile devices. With the advent of the fifth generation, however, the number of cybercrimes may increase. This requires building an architecture that can adequately protect against these attacks. For wired networks, the SDN-type architecture has been introduced for some time. As a result, a similar design concept has emerged, which is called Software Defined Mobile Networks (SDMN). This article describes this technology and how it helps prevents DoS, DDoS at-tacks, and IP source spoofing.