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## Overview

- IP
- IP: v4 and v6
- Class A, B, C, D
- CIDR
- Mask
@@ -12,7 +12,22 @@
- ICMP (`ping`, traceroute)
- UDP
- TCP
- DNS
- Commands
- `host`
- `nslookup`
- `ifconfig`

## The Internet

There are multiple ways to get to where you want to go.

1. A computer makes a request for some information from a location.
2. The receiving end understands the request and sends the information back.

When you call someone, you look them up in your contacts, when you go to
`www.google.com`, your computer looks up its ip address in Domain Name System
(DNS)

An ip (v4) address is always in this format: XXX.XXX.XXX.XXX, for example,
127.0.0.1

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