Network world is created by people, it has a strong logical, at the same time, the online world of many many problems with the real problem with similarity,
Routing is not only so, routing is like a road sign, for the transmission of packets between equipment when the redirection, planning priority for them, the best path to go where they should go,
Best path in the routing planning, there are three layer routing principle, respectively is the longest mask routing principle, administrative distance routing principle and measurement principle,
Maximum principle: (mask, mask, also called netmask address mask, subnet mask, it is a kind of used to specify an IP address of what a logo is the host's subnet, and what a logo is hosting a bitmask,) when there are multiple routing can be matched to the destination address, choose the mask the longest route,
Administrative distance routing distance principle: (management refers to a kind of routing protocol routing credibility, each kind of routing protocol according to the reliability from high to low, in turn, assign a level of trust) of multiple routing can match the destination address, and mask as long, this time using the administrative distance of routing, manageability, an example is given to the smaller priority,
Measurement principle: (each routing algorithm in generating routing table, for each path through the network to create a numerical (measurement), the smallest value indicates that the optimal path,) of multiple routing can match the destination address, and mask as long, administrative distance is the same, this time measurements within the same agreement,
In the network world, routing is varied, it is roughly divided into direct routing, static routing, dynamic routing,
Direct routing: equipment and device interfaces directly connected,
Static routing: manually configured by the network administrator, usually for internal and external network docking, routing through configuration priority selection, including the default route is a special kind of static routing, in the real world, for a network of export mostly using static routing,
Dynamic routing, dynamic routing as opposed to a static route is a concept, referring to the router can according to the specific routing information exchange between the router to automatically set up their own routing table, and be able to timely according to the variation of links and nodes for automatic adjustment,