y already have, they insert in their own routing table(s). Over time, all the nodes in the network will discover the best next hop for all destinations, and the best total cost. When one of the nodes involved goes down, those nodes which used it as their next hop for certain destinations discard those entries, and create new routing-table information. They then pass this information to all adjacent nodes, which then repeat the process. Eventually all the nodes in the network receive the updated information, and will then discover new paths to all the destinations which they can still "reach". According to the Algorithm, the 5 buildings distance is 1km, we can find out a minimize routing table.
5.5 WAN design
As the project requirement, we know that the DNS is putted in the first building, that is the first building is the information center. So the other four buildings' switches are be linked to the first building. Because the distance between each building is too far, we use optical cable to translate the information to ensure the signal is enough strong.
Wan is composed by many switches, switch between the point-to-point circuit connection several wan distribution
The all point-to-point communication mode can be used to establish the wan, including leased lines, optical fiber, microwave, satellite channel. And wan switches is actually a computer, have processor and input/output devices packets transceiver processing. WAN most commonly contain only the OSI reference model under three layers, and so far most WAN USES store-and-forward mode exchange data, i.e., WAN is based on a message switching or packet switching (traditional public switched telephone network except). Wan sends the switch to complete its packets off and then after receiving route choice find a output lines, finally switches will receive packets sent to that line up, and so on, until the packet on the objective nodes. Chapter 1 we mentioned the wan can provide connection-oriented and connectionless two service mode, corresponding to the two kinds of service mode, wan has two kinds of network mode: virtual circuits (vehicle) mode and order data submitted to (d a t a g r a m) way, below I will discuss the wan's two network mode, and to compare them.
A virtual circuit and data reported
For the ways of a virtual circuit source node and wan, communicate, purpose node before first must establish a from source node to destination node of virtual circuits (i.e. logical connection), and then through the virtual circuit data transfer, finally when data transmission over, the release of the virtual circuit. In a virtual circuit manner, each switches are maintaining a virtual circuit table, to record after the switch all the virtual circuit, each of the virtual circuit occupy a among them. In a
5.6 router
In the project, in order to design a LAN in every building, we need at least 2 routers every building. Because we are given the level C network address, and the level C network address can only support at most 255 computers.
A router is an electronic device that interconnects two or more computer networks, and selectively interchanges packets of data between them. Each data packet contains address information that a router can use to determine if the source and destination are on the same network, or if the data packet must be transferred from one network to another. When multiple routers are
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