Wednesday, September 12, 2018

IP Routing technologies


                                   IP Routing technologies

Introduction to IP Routing

IP routing—the process of forwarding IP packets—delivers packets across entire TCP/IP networks, from the device that originally builds the IP packet to the device that is supposed to receive the packet. In other words, IP routing delivers IP packets from the sending host to the destination host.

Routers don’t really care about hosts they care only about networks and the best path to each network. The logical network address of the destination host is used to get packets to a network through a routed network, and then the hardware address of the host is used to deliver the packet from a router to the correct destination host.
Routing table is used to find best path to destination. Forwarding decisions based on Layer 3. IP performs search for a matching host address, search for a matching network address, and search for a default entry, Routing done by IP router, when it searches the routing table and decides which interface to end a packet out.
When a router receives a packet, it examines the destination IP address. If the destination IP address does not belong to any of the router’s directly connected networks, the router must forward this packet to another router.


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