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时间:2021-10-13 21:00 来源: Essay代写

摘要:路由器是一种连接多个网络或网段的网络设备,它能将不同网络或网段之间的数据信息进行“翻译”,以使它们能够......

With the rapid development of Internet, people are no longer satisfied to share information only on the local network , but want to maximize the use of the various regions of the world , all types of network resources, network routing technology has become a key part of the router also will become the most important network equipment. Under the present circumstances, any one of a certain scale computer networks ( such as enterprise networks, campus networks , intelligent building , etc. ) , regardless of the network technology is fast with big , FDDI technology, or ATM technology , are inseparable from the router , otherwise it does not work properly and management.


Router works. Devices in the network (TCP / IP is the IP address of the network ) communicate with each other using their network address. An IP address is the hardware address unrelated "logical" address. Routers only forward packets based on IP addresses . IP address of the structure has two parts, one to define the network number , host number to another part of the definition of the network. Currently , the use of the Internet subnet mask to determine the IP address of the network and host addresses . IP address and subnet mask as also 32bit, and both one to one and provides the subnet mask in the number " 1 " corresponding to the IP address of the part of the network number , "0" by compared with the corresponding host number . The network number and host number together , will constitute a complete IP address. The same network host IP address, network number must be the same , the network is called IP subnet. Communication only between IP addresses have the same network number will be , with a host of other IP subnets to communicate , you must go through a router or gateway (gateway) to go out on the same network . Different IP addresses can not communicate directly with the network number , even if they are connected together and can not communicate. Router has multiple ports for connecting multiple IP subnets. Network number required for each IP address and port number of IP subnets connected to the same network . Different ports for different network numbers , corresponding to different IP subnets , so as to enable the subnet host through its own subnet IP address of the IP packet sent out requests on the router.


The main function of the router . Routing actions include two basic elements: routing and forwarding. I.e., to determine the best routing paths to reach the destination , by the routing algorithm. In order to determine the best path routing algorithm must start and maintain routing table contains routing information , which depends on the routing information used in routing algorithm and different. Routing algorithm will be collected to fill in different information in the routing table , the routing table with the next stop may be the destination network (nexthop) relationship tells the router . Routers exchange routing information updates, update and maintain routing tables make it accurately reflect the changes in the network topology , according to measurements by the router to determine the best path. That is good forwards along the best path routing information packets transmitted . Router first looks in the routing table , to know how to judge whether a packet is sent to the next station ( router or host ) , if the router does not know how to send a packet , the packet is usually discarded ; otherwise it will be grouped according to the corresponding routing table entries sent to the next site , if the purpose of the network is directly connected to the router, put the packet directly to the corresponding port. This is the route forwarding protocol (routed protocol). Forwarding routing protocols and routing protocols is mutual cooperation and mutually independent concepts , the former uses the latter to maintain routing tables , to take advantage of the former while the latter provides functionality to publish routing protocol packets.


Routing protocols . Typical routing in two ways: static and dynamic routing . Static routing is fixed routing table settings in the router. Unless the network administrator intervention , otherwise static route will not change. Static routing can not be made to reflect changes in the network, generally used for small -scale network , fixed network topology . Advantages of static routing is simple, efficient, and reliable. In all routing , static routing highest priority . When the dynamic routing and static routing conflict, static routing prevail. Dynamic routing is the communication between routers in the network , routing information , use a router table update routing information received in the course . It can adapt to changes in real-time network structure . If the routing update information indicates that a network change has occurred , the routing software recalculates the route and issue a new routing updates. Information through various networks , causing the router to restart its routing algorithm, and update their routing tables to reflect the network topology changes dynamically . Dynamic routing for network scale, complex network topology . Of course , a variety of dynamic routing protocols will be different degrees of network bandwidth and CPU resources. Static and dynamic routing have their own characteristics and scope , so dynamic routing in the network as a supplement is usually static routing . When a packet router for routing , static routing router first looks , if found then forwards the packet according to the corresponding static routing ; otherwise find another dynamic routing .

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