System administration, network and virtualization introduction

What is TCP/IP?

TCP header definition

source: Wikipedia

What is a DNS nameserver?

DNS resolution example

source: Wikipedia

Some widely used ports

  • 80 HTTP
  • 443 HTTPS

  • 53 DNS

  • 22 SSH

  • 123 NTP

  • 25 SMTP

What is Apache 2?

|||v

<html>
  <head>
    <title>My awesome website</title>
  </head>
  <body>
    Awesome! It works!
  </body>
</html>

|||

Apache 2 render example