Computer Networking

Size as well as complexity of communication networks
(e.g. enterprise, backbone, data center) are increasing day-by-
day. Software-Defined Networking (SDN) promises to enhance
manageability of such networks by decoupling control plan of a
switch/router from its data plane. However, SDN itself could also introduce security threats e.g. Denial of Service (DoS), etc. on such networks. Protocols which are used for SDN must be analyzed in terms of security or else they bear a severe security risk, if potential security threats are not recognized. This paper analyses three of the most used protocols in SDN; the OpenFlow, OFConfig and OVSDB protocol using Microsoft’s STRIDE Threat Modeling. Security flaws have been found in all three protocols, especially if no encryption mechanisms like TLS is used.

In this paper, we explain the most important phase of security architecture for Internet of Things (IoT) based on software-defined networking (SDN). In this context, the SDN-based architecture is executed with or without the infrastructure; this is also called as SDN-Domain. This works gives briefing of the operations of the proposed architecture and summarizes the opportunity to achieve network security in a more effective and flexible with the presence of SDN. In this paper, we assumed the network access control and global traffic monitoring for ad-hoc networks. Finally, we point out the architectural design choices for SDN using Open Flow and discuss their performance implications.

— This review paper explains Software Defined Networking (SDN), wherein control and forwarding planes are detached, shifting all the network intelligence to a server (SDN controller) to make a logically centralized network infrastructure. Open Flow protocol is the communication interface between control and forwarding plane. It allows researchers to experiment their abstractions in heterogeneous environment in a uniform way at line-rate and with high port-density; while on the other hand, manufacturers need not reveal the interior design and operations of their switches. Open Networking Foundation (ONF) community is encouraging different vendors to introduce OpenFlow in their products and elevate networking related innovations in worldwide college campuses.

The various convergent technologies nowadays in computer infrastructure, impose an additional burden on existing networks, the need to save technical and budgetary resources, lead companies and public agencies to verify the existence of means of better utilization of the infra-structured network, in order to provide Integrated services (IntServ) and / or differentiated (DifServ), causing all or almost all the gain of a structure that required time and financial resources to be assembled. In view of such a scenario, the implementation of VoIP (voice over IP) technologies is shown as not only an alternative but a premise for resource utilization, cost reduction and control of large-scale communications within an organization. The objective of this work is to demonstrate the installation of the 3CX tool (formerly ELASTIX) compiled in Debian / LINUX operating system, its applications and implications in small, medium and large companies and bodies, aiming to be not only an alternative but a service initiative Differentiated technology that converged networks offer us.

ÖZET Eğitici Bilişim Teknolojileri Formatör Öğretmenleri başta olmak üzere, tüm öğretmenlerimize Bilişim Teknolojileri alanında ihtiyaç duyulan eğitimler verilmektedir. Cisco BTT ve CCNA Eğitimlerinin verilmesi için 2006 yılında EĞİTEK-TBV Bölgesel Akademi kuruldu. Merkezi ve Mahalli Hizmet içi Eğitimler aracılığıyla öğretmenlerimize bu eğitimler verilmektedir. Yerel Eğitim Merkezi unvanını almış okullara teknik ve eğitim desteği sağlanmaktadır. Eğitimler, olmak üzere iki kategoride verilmektedir. Eğitmen Eğitimlerinde, 3 hafta çevrimiçi ve 2 hafta yüz yüze olmak üzere karma bir eğitim modeli uygulanmaktadır. Katılımcıların eğitimler sonunda çevrimiçi bir sınava girmeleri ve bu sınavda başarılı olmaları gerekmektedir. Öğrenci Eğitimleri 80 saat yüz yüze olarak uygulanmaktadır. Eğitim materyallerine sınıf ortamından bağımsız olarak, çevrimiçi (çevrimiçi) erişilebilir. Materyallerin farklı dil desteği ile öğrencilerin yabancı dillerini geliştirilmelerini sağlamak mümkündür. Bu çalışmada yapılan bu eğitimlerin ağ eğitimine sağladığı avantajlar vurgulanarak, istatistikî bilgiler ışığında meslek liselerindeki ağ eğitimlerinde gelinen nokta gözler önüne serilmektedir. ABSTRACT Educational Information Technology Formator Teachers, in particular the training of all teachers are needed in the field of Information Technology. Cisco CCNA Trained-TBV Regional Trainings for the submission of the Academy was founded in 2006. Central and local-service training through the training teachers are given. Local Training Centers have the title of technical and training support provided to schools. Training is given in two categories. The instructor in education, have 3 weeks and 2 weeks in a mixed education model is applied to the face-to-face. At the end of training participants, need to be successful in this examination and attend an online exam. Student Programs implemented in 80 hours face to face. Educational materials, available online, regardless of classroom environment. Provide students with the support of different languages in the development of foreign language materials are possible. In this study, with emphasis on the benefits of this training network training, network training in vocational high schools reached the point where the light of statistical information are discussed.

With the tremendous growth of network-based services and users of the Internet, it is important to keep the data and
transactions in the internet more secure. Since the volume of sensitive and valuable information passing over the
Internet is growing very large, the security attacks like Phishing, Spoofing, Flooding, Virus, and Spam are
increasing. The Internet attackers can forge the source address of IP packets to both maintain their anonymity and
redirect the blame for attacks. These spoofing packets are often part of some malicious activity, such as a DDoS
attack. To thwart DDoS attacks, researchers have taken two distinct approaches: packet filtering and packet tracing.
Packet filtering mechanism defines to detect and filter the attacked packet and Packet tracing mechanism defines to
detect and trace the source, block the attacked traffic. In the proposed work, combining these two mechanisms to
effectively detect, filter and also trace the DDoS attack.