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Router Forwarding

Network Fundamentals / Ch. 5 - Fundamentals of IP Addressing and Routing

Router Forwarding Logic
Step 1. Use the data-link FCS field to ensure that the frame had no errors; if errors occurred, discard the frame.
Step 2. Assuming the frame was not discarded at step 1, discard the old data-link header and trailer, leaving the IP packet.
Step 3. Compare the IP packet’s destination IP address to the routing table, and find the route that matches the destination address. This route identifies the outgoing interface of the router, and possibly the next-hop router.
Step 4. Encapsulate the IP packet inside a new data-link header and trailer, appropriate for the outgoing interface, and forward the frame.
Created by: k3ntucky
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