Computer Networks, the Internet and Next Generation by Thi-Thanh-Mai Hoang
By Thi-Thanh-Mai Hoang
Such a lot laptop community books are defined in keeping with a top-down or button-up layer-based point of view - permitting readers to profit approximately ideas and protocols in a single layer as part of a fancy approach. At each one layer, the books illustrated the mechanisms and protocols supplied at this accretion to its top layer. in contrast to different machine community books, this ebook also offers protocol-based and architecture-based standpoint to check the pc networks, the web and subsequent new release Networks. The e-book begins with a quick creation to the pc community and their layout - overlaying the fundamental reference types, the multimedia networking, subsequent iteration Networking and cellular Networking in addition to community making plans issues. basic concepts are defined - masking mechanisms, protocols, architectures and providers to manage the site visitors and make sure the QoS for info and multimedia purposes. for every approach, the writer formulates the matter assertion and illustrates entire answer - together with simple inspiration, thought, structure, protocol behaviour, their benefits and drawbacks.
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Extra resources for Computer Networks, the Internet and Next Generation Networks: A Protocol-based and Architecture-based Perspective (European University Studies, Series ... / Publications Universitaires Europe)
For examples, the IPv4 type of service, IPv6’s traffic class, IPv6’s flow label and DiffServ code point are the fixed bit combinations used for classification. 3 Traffic Policing and Traffic Shaping Each traffic class has a traffic profile defining certain limits to its allowable temporal behaviour – a limit on arrive rate of the packets at a router and burst size during some specified interval. Policing and shaping are mechanisms defining the actions taken by a router when it determines that a packet is outside the limits assigned to the traffic class to which the packet belongs.
Four important criteria used by traffic policing and shaping are: Mean rate — specifies how much data can be sent or forwarded per unit time on average. A network may wish to limit the long-term mean rate at which packets belonging to a flow can be sent into the network. Peak rate — is a constraint that limits the maximal arrive rate of a flow over a short period of time. Burst size — specifies (in bytes) how much traffic can be sent within a given unit of time. The network may also wish to limit the maximum number of packets a flow can sent into the network over an extremely short interval of time.
In order to avoid that many adapters immediately start transmitting the data when the channel becomes free, an adapter waits for a random time before attempting a retransmission. The advantages of the CSMS/CD is that no synchronization is needed – each adapter runs CSMA/CD without coordination with other adapters. By this way, transmission delay will be reduced. 3 for 1-persistent CSMA/CD LAN. The CSMS/CD is used in the Ethernet. Figure 3-11 shows the CSMA/CD frame format [Tan-2002]. Preamble (PR): The preamble for the synchronization of the receivers.