# Week 11 - How the internet works

### What is a Network

### TCP/IP

IP Address

IPv4 - 0.0.0.0 - 255.255.255.255

4,294,967,296 Addresses

192.168.

127.0.0.1 - local loopback address - localhost

IPv6 `2^128`

FE38:DCE3:124C:C1A2:BA03:6745:EF1C:683D

0000 - FFFF

340,282,366,920,938,463,463,374,607,431,768,211,456
3.4 x 10^38

### DNS - Domain Name Service

TLD = Top Level Domain - .com .org .net .edu .mil .gov .uk .ru .jp

google.com quansight.com

DNS settings Go to this IP address to look up the ip address of this domain name.

### HTTP
HyperText Transfer Protocol

Human Readable

GET / HTTP/1.1

POST /items/ HTTP/1.1
Header1: Blah
Header2: BlahBlah

first_name: Trent
last_name: Oliphant

### Web Services

### Frameworks

- Frontends
- Javascript
- Angular
- Vue / Nuxt
- React
- Backend