Networking Overview

TODO:

this page is abysmal. fix.

Tutorials

code a TCP/IP stack

https://www.saminiir.com/lets-code-tcp-ip-stack-1-ethernet-arp/

Basics

Information sent over a network is layered like an onion.
As you progress from datalink to transport layers, the outer layers are removed from the packet
leaving only information that is useful to each stage.

<!-- a pseudocode piece of network data -->
<datalink>
  <network>
    <transport>
      <application/>
    </transport>
  </network>
</datalink>

5-layer TCP/IP model

-	layer	protocol	unit	address
1	physical	10 Base T, 802.11	Bits	n/a
2	datalink	Ethernet, WiFi	Frames	MAC addr
3	network	IP	Datagram	IP addr
4	transport	TCP, UDP	Segment	Ports
5	application	HTTP, SMTP, ..	Messages	n/a