Computer Networks, the Internet and Next Generation Networks: A Protocol-based and Architecture-based Perspective (Europäische Hochschulschriften / ... / Publications Universitaires Européennes)
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Most computer network books are described based on a top-down or button-up layer-based perspective - allowing readers to learn about concepts and protocols in one layer as a part of a complex system. At each layer, the books illustrated the mechanisms and protocols provided at this layer to its upper layer. Unlike other computer network books, this book additionally provides protocol-based and architecture-based perspective to study the computer networks, the Internet and Next Generation Networks. The book starts with a short introduction to the computer network and their design - covering the basic reference models, the multimedia networking, Next Generation Networking and Mobile Networking as well as network planning considerations. Fundamental techniques are described - covering mechanisms, protocols, architectures and services to control the traffic and ensure the QoS for data and multimedia applications. For each technique, the author formulates the problem statement and illustrates complete solution - including basic idea, concept, architecture, protocol behaviour, their advantages and disadvantages.
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Queues with different priority level (figure 3-20). Depending on priorities defined in the packet headers, packets are queued into queues. If there are packets waiting in both higher and lower queue, the scheduler serves packets from the higher queue before it serves the lower one. For example, the packets with priority 1 in figure 3-20 are always served first. Packets within a priority queue are usually served with FIFO discipline. Packets of priority of i are served only if the queues 1 through.
Start algorithm. 22.214.171.124.2 Congestion Avoidance TCP performs the congestion avoidance algorithm if there is no loss event and the congestion window is above the slow start threshold. During congestion avoidance, cwnd is incremented by 1 full-sized segment per round-trip time (RTT). Congestion avoidance continues to work until TCP observes the loss event via timeout. Figure 3-22 illustrates the slow start and congestion avoidance algorithm in pseudo code and figure 3-23 shows the cwnd behaviour.
The shortest path to R1 if R1 can be reached by a one-hop path from a router already in R. Detail about Dijktra’s shortest path algorithm is described in [Tan-2004]. 126.96.36.199.3 Routing table update The result of the Dijktra’s algorithm at a router is a shortest path tree describing shortest paths from this router to all routers in the network. Using the shortest path tree, each router updates its own routing table. For each shortest path to a destination, the router only takes the hop, which is.
Security and transport protocols. In general, the connection mode is used for larger data objects where security or reliability is required. Additionally, the datagram/connection mode selection decision is made by GIST on the basis of the message characteristics and the transfer attributes stated by the applications. However it is possible to mix these two modes along the data flow path. For example, GIST can apply datagram mode at the edges of the network and connection mode in the network core.
Protocols illustrated in the previous section. At each layer, selected protocols and technologies with used mechanisms are discussed. Finally, the next generation 16 network architecture, its fundamental mechanisms and the IMS (IP Multimedia Subsystem) are described. The outline of this script is described as follows. Chapter 2 gives background information about computer networks and their design. Section 2.1 provides a brief description of the basis reference models for communication systems.