TCP = Transmission Control Protocol

Ports 1-65535

HTTP:80

HTTPS:443

FTP:21

First 32 bits in a TCP header are the source and destination ports

Netcat:

Command line tool for interactin with TCP and UDP

send files or data between machines

creating backdoors, funnel command shells

port redirection

port scanner/listeners

netcat can be used as a web browser

in linux terminal

nc www.google.com 80

press enter then - GET / HTTP/1.1

then double click enter

talking to yourself

open two terminal windows

nc -l 4000

enter then message

Other devices