Curriculum
Module 03
The Network
What the request crosses before it reaches you, and the one physical limit in the whole course.
5 lessons · 2 videos · 1h 35m
- 03.01
Speed of Light Is a Floor
Compute the round-trip floor between two regions from distance alone, and say why no amount of engineering removes it.
- 03.02
DNS
Trace what happens between typing a hostname and opening a connection, and name what fails when resolution does.
- 03.03
Connections Cost Something
Use the bandwidth-delay product to explain why a fat pipe underperforms over distance, and why throughput is window divided by RTT.
- 03.04
TLS
Describe what the handshake establishes and what a certificate actually proves.
- 03.05
CDNs and the Edge
Explain anycast and the cache key, and say what the edge cannot do for you.