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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