Der vorliegende Beitrag führt in das Thema Netzwerkvirtualisierung ein, beleuchtet die unterschiedlichen Methoden in LAN, WLAN und WAN und zeigt anhand konkreter Praxisbeispiele, inwieweit die konsequente Virtualisierung von Netzen – wir sprechen von „Total Network Virtualization“ – Unternehmen helfen kann, sowohl bei den Investitionen als auch bei Betriebskosten massiv Kosten zu reduzieren. 1 ...

The article deals with a WAN switch design based on a Feedforward neural network, specifically for the Feedforward Backpropagation algorithm. The designed switch is fully parallel, uses neural network for switch management and also for traffic engineering. The switch uses advanced packet dropping mechanism. The article describes the switch design (network processor design) and compares the deve...

Article history: Received 22 June 2010 Revised 21 November 2010 Accepted 12 February 2011 Available online xxxx Communicated by Zhe-Xian Wan MSC: 11T35 11T06 20G40 15B05

Article history: Received 9 July 2012 Accepted 23 June 2013 Available online 4 September 2013 Communicated by D. Wan MSC: primary 20D20 secondary 11T06, 13M10, 11C08, 13F20, 20E18

This paper explores ways to provide strong consistency for Internet applications scaling to millions of clients. We make four contributions. First, we identify the ways in which specific characteristics of data-access workloads affect the scalability of cache consistency algorithms. Second, we define two primitive mechanisms, split and join for growing and shrinking hierarchies. We show how the...

Workgroup multimedia applications such as videoconference, teleteaching or CSCW demand multipoint service from Telecommunication Networks. This is not just a broadcast service but it is a service where N sites transmit traffic to N sites. This service requires that the network support a large number of workgroups with few (5-20) participants together with low delay, low delay jitter, high throu...

Convergence of data and telephony networks is one of the current trends in telecommunications. It is supposed that all telephony traffic might be carried over a common data network infrastructure in the future. In accordance with this development, wide area IP telephony network has been deployed in the TEN-155 CZ network (located in Czech Republic), connected to the European network for researc...

Proxy technology is commonly used a t boundaries of ISPs (Internet Service Providers) to reduce the bandwidth requirement in the backbone WAN. By caching portions of a video in a video proxy closed to clients, the video playback quality can be dramatically improved and the problem of insufficient WAN bandwidth is eliminated. In the loss-less nehvork environment, the OC (Optimal Cache) algorithm...