TCP/IP
Contents
What is a protocol
TCPIP Stack
Application layer
Transport layer
Network layer
Link layer
Ports
Why we need them
Well known port numbers
21 TCP File Transfer Protocol (FTP) control 22 Secure Shell (SSH), secure logins file transfers and port forwarding
Socket
Protocols
http
Hyper Text Transfer Protocol, most often found at the beginning of URLs, is used to transfer an user to a web address that is specified via the domain.
https
A verified, secure version of HTTP. This ensures the user that the website they are on is safe and well protected.
ftp
File Transfer Protocol.
SSH
Secure Shell protocol. Designed for operating securely over an unsecure network.
telnet
Allows a user to log into a remote computer over the interlinking network.
pop3
Post Office Protocol, version 3.
smtp
Simple Mail Transfer Protocol.
