W04 // INTERNET, CLIENT/SERVER, IP, DNS
SEP 9 · Ch 2 Sec 1-4 + Vannevar Bush · DUE: Diagram: the life of a request
This week's deckPPTX
// RUN OF SHOW (8:45-10:15)
8:45
Stand-up: last week's deliverable graded, questions answered
9:20
At the keyboard: guided type-along
9:45
Build time: assignment or project work
10:10
Close: commit, push, and preview next week's reading
// THE POINT THIS WEEK
How the internet moves data. Clients and servers. IP addressing and routing. DNS as the phonebook.
// TALKING POINTS
The net is a relay race
- Your browser is a client: it asks; servers answer
- Messages travel as packets, each addressed and routed independently
- Routers pass packets toward their destination one hop at a time
Names and numbers
- Devices are found by IP address, a number like 93.184.216.34
- Humans prefer names; DNS is the phonebook that turns names into numbers
- One page load can trigger dozens of DNS lookups and hundreds of packets
// LINKS