Dynamic routes are routes to remote networks that were learned automatically by the router through a dynamic routing protocol. Routing table entries to remote networks may be either dynamic or static. The network address and subnet mask of the interface, along with the interface type and number, are entered into the routing table as a directly connected network.Ī remote network is a network that can only be reached by sending the packet to another router.
A directly connected network is a network that is directly attached to one of the router interfaces. When a router interface is configured with an IP address and subnet mask, the interface becomes a host on that attached network. Hop-by-hop is the fundamental characteristic of the IP Internet layer and the OSI Network Layer. Assuming that the routing tables are consistent, the simple algorithm of relaying packets to their destination's next hop thus suffices to deliver data anywhere in a network. With hop-by-hop routing, each routing table lists, for all reachable destinations, the address of the next device along the path to that destination: the next hop. The next hop association can also be the outgoing or exit interface to the final destination. These associations tell a router that a particular destination can be optimally reached by sending the packet to a specific router that represents the next hop on the way to the final destination. The routing table contains network/next hop associations. To do this, a router needs to search the routing information stored in its routing table. The primary function of a router is to forward a packet toward its destination network, which is the destination IP address of the packet. Nodes can also share the contents of their routing table with other nodes. A routing table is a data file in RAM that is used to store route information about directly connected and remote networks. A routing table is a database that keeps track of paths, like a map, and uses these to determine which way to forward traffic. Each node needs to keep track of which way to deliver various packages of data, and for this it uses a routing table. If the node cannot directly connect to the destination node, it has to send it via other nodes along a route to the destination node.
Whenever a node needs to send data to another node on a network, it must first know where to send it. A routing table is analogous to a distribution map in package delivery.
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