1、23 and Wireless sensor networks ,Microwave signal transmission technology and the gigabit optical fiber.45 6Figure 6.1 Classification of networks by spanning distance7【紫峰技术紫峰技术（协议）（协议）】8910 11Figure 6.2 LAN Topologies121314主（骨）干网主（骨）干网15【蜂窝网络技术蜂窝网络技术】16171819Figure 6.3 TCP/IP and OSI model2021 22 23
2、 24 25 26信息组；信息组；字段（域）字段（域）27 282930313233343536 Bridge【网桥网桥】is an equipment which works at the data link layer to achieve LAN interconnection.It can divide a big LAN into several network segments.In general,bridge receives MAC data frame from LAN.After opening,and validating the frame,bridge will s
3、end it to the physical layer according to another LAN reassembling data frame【重组数据帧重组数据帧】.Because the bridge is a data link layer device,it may not deal with the data header that upper layer protocols put in.The basic features of bridge are as follows:bridge can connect different LANs at data link l
4、ayer;bridge can connect LANs which have different data link layer protocol,different transmission medium and different transmission speed;bridge connect the internet and transmit/receive data,gives information about the storage,filter MAC address,and retransmit data packets.373839404142434445 464748
5、4950 5152 传承传承 535455【抖动抖动/闪烁闪烁的视频的视频】56575859also called an intra-nodes cooperation【节点内协作节点内协作】,whereas the concept of a larger,wider grid is related to an inter-nodes cooperation【节点间的协作节点间的协作】.Grids are a form of distributed computing whereby a“super virtual computer”is made up of many networked l
6、oosely coupled computers which can act together to accomplish very large,complicated tasks.The technique has been widely used in computationally intensive scientific,mathematical,and academic problems through volunteer computing,and it is used in commercial enterprises for various applications such
7、as economic forecasting,seismic saizmik analysis【地震分析地震分析】,drug discovery,and back office data processing in support for e-commerce and Web services.Resource coordination on grids become increasingly complex,especially when coordinating the flow of information across distributed computing resources.60 片上的，内置的片上的，内置的61626364 plit 6566冲突冲突6768【冷藏的冷藏的】69707172Figure 6.10 A high-level overview of the SDN architecture7374757677787980818283 848586
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