ip网络的服务质量序言（国外英文资料）.docVIP

ip网络的服务质量序言（国外英文资料） Lead it There are many signs in the development of the Internet -- from the exciting information superhighway to the gloomy World Wide Wait. As an impressive and network interconnection of integration in the world, the Internet in a variety of speed would carry a lot of information to a variety of different locations, so can say that the Internet could really like highway. However, most people have experienced the so-called highway brings unexpected service, we can hardly deny that the Internet in the development of the existence of waiting worldwide. The information superhighway sometimes is like a water everywhere without fixed streets, to ease traffic flow, usually choose according to the importance of some group, delay to send or abandoned completely. Quality of Service (QoS) is about minimizing this type of problem. Why do we need service quality Most people who see the word Best Effort when they are playing a word game may first respond to the Internet. The Internet Protocol (Internet Protocol, TCP/IP) the development of a clear, centrally reflects the history to seek and establish a connection in various circumstances of the development of the network technology. Once the group given its final destination address, the network will (as much as possible) to determine a path through any of the available internal link, to complete the transfer of a packet to the destination. The actual time (transport delay) that the network delivers is the second question we should consider. If due to the network in the long-term or short-term problem caused in the network can not reach the destination address of pathway, grouping could be discarded (a rather extreme form of delay). In both cases, the network does not return any information to the source side of the group to indicate whether the grouping is successful or failed. Its like a letter from a postman who says, leave it to me, and just try to send it as hard as you can. If you need to provide guaran