Routing and how the internet connects
How routers choose paths, how networks exchange routes with BGP, and how to read a traceroute properly.
- Advanced
- Level
- 3
- Lessons
- 5 min
- Study time
Course content
- 1. How routers decideEvery router holds a routing table: a list of networks and where to send packets for each. On Linux, view it with ip route:1 min
- 2. BGP: how networks connectThe internet is tens of thousands of independent networks, each called an Autonomous System (AS) with its own number (ASN). BGP is how they tell each other which addresses they can reach.2 min
- 3. Reading traceroute and mtrtraceroute shows each router between you and a destination. It's useful, but it's also the most misread tool in networking.2 min