N Is For Networking N4N017: Routing Fundamentals
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Mar 13, 2025 Dive into the essentials of layer 3 routing and unlock the mysteries of routers and routing tables. Explore the evolution of IP and the hurdles of new technologies. Learn how routers direct packets and the vital role subnetting plays. Discover the differences between static and default routes, plus the power of dynamic protocols like BGP and OSPF. Engage with practical Wireshark exercises and unravel the connections between packets and frames for a deeper networking understanding.
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Routing Fundamentals
- Routing operates at Layer 3 of the OSI model, focusing on packets instead of frames.
- Routers make forwarding decisions based on destination IP addresses, consulting their routing table.
Pre-IP Routing
- Ethan Banks recalls working with older Layer 3 protocols like IPX and AppleTalk.
- While IP dominates modern networking, other protocols existed and continue to be developed.
Router Forwarding
- Routers forward packets based on destination IP addresses, using a routing table.
- The routing table determines the appropriate outbound link to move the packet towards its destination.