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The network convergence time may take hundreds of milliseconds or more. Since this repair performance may be unsatisfactory, IP fast reroute (IPFRR) approaches have been developed to decrease the network convergence time and minimize traffic loss. These IPFRR mechanisms are usually based on the proactive precomputation of a backup path before a failure occurs. Once a failure is detected, the router...
At the beginning, there is overview of three basic Cloud Computing services — SaaS, PaaS and laaS. There is a definition of these services review, advantages and their security problems and effects. Next part tells about portability problems of each service, mainly the IaaS service, which has the most interoperability and portability problems.
To identify all the hidden details that are left after or during a network incident, the computer forensics is used. The purpose of computer forensic techniques is to search, preserve and analyze information on computer systems to find potential evidence for a trial. Computers are getting more powerful day by day, so the field of computer forensics must rapidly evolve. There exist many computer forensic...
At the beginning, this paper describes basic overview of Cloud Computing (CC) and its usage among companies. Second part describes how is Cloud Computing being taught on another schools and companies around the world. Next, there is description of our physical and logical topology, used during experiments. In the next part, there are descriptions of experiments we made during semester while teaching...
The slow convergence of existing routing protocols after link or node failure became a problem. As a solution IP fast Reroute mechanisms have been developed. IP Fast Reroute mechanisms offer rapid network recovery after link or node failure. The basic idea of the IP Fast Reroute is to pre-calculate alternative backup path in advance. In the case of failure IP Fast Reroute Mechanism will use pre-calculated...
In the beginning, this paper describes basic overview of attacks on TCP/IP stack in general. In the next section, there is overview of security of signalization and description of techniques used to secure signalization in multimedia communication. Then, there are described techniques of multimedia security. The last part of the paper deals with a Public key infrastructure (PKI) and aspects of its...
When a link or router failure occurs in a routed network, there is unpredictable period of network traffic interruption. This problem persists until network reconverges on the new topology. New technology which solves these problems after link or router failure has been developed - IP Fast Reroute (IPFRR).
In the beginning, this paper describes basic overview of cloud. What is a cloud, what types of a cloud do we know, types of network mechanisms used in clouds nowadays. Next, there is description of OpenStack, one of most widely deployed cloud infrastructure. This is followed by description of Cloud implemented on Department of InfoCom networks on University of Žilina. In the last part, there is vision...
The IPFRR technology provides fast network recovery after a link or router failure within an ISP network. During the link or the router failure within network, there is unpredictable period of time when part of communication is lost until the process of network convergence will complete. During this process specific networks may become unavailable and problems with critical applications and services,...
After a link or router failure within a network, a process of network convergence starts. During this process, the network is experiencing serious connectivity issues, in which different destinations may become unreachable and which may cause difficulties for critical and sensitive services. In order to address these issues, IP Fast ReRoute (IPFRR) mechanisms have been developed. The main goal of...
The interest in integrating real-time and realtime multimedia communication features into IP networks and its applications, the web including, started a development effort, which brings several new communication technologies. These technologies are influencing many aspects of our lives now, education not excluding. The Session Initiation Protocol (SIP) and the Web Real-Time Communication (WebRTC)...
After a network node or a link fails, an unpredictable period of time ensues during which the network communication is disturbed. This period encompasses the time necessary for the network to reconverge on new shortest paths. This process may last from a few miliseconds up to tens of seconds. The time heavily depends on the physical topology and the routing protocol used. During the failure and reconvergence...
After the failure of a network node or a link, a period of impaired connectivity is experienced until the network reconverges. During this period, specific destinations are not reachable, causing issues specifically with critical and timesensitive services such as Voice over IP. The process of network reconvergence can last from a few milliseconds to tens of seconds. To address these issues, IP Fast...
Over the last few years, Internet Protocol (IP) networks have made significant progress, allowing to provide voice over IP (VoIP) and other real-time services. The quality of provided real-time services depends on quality parameters of the network (QoS). One of the leading QoS parameters is the survivability of network itself. The survivability parameter reflects on how fast the network will recover...
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