https://github.com/librity/ft_netwhat
42 São Paulo - netwhat
https://github.com/librity/ft_netwhat
42 42born2code 42saopaulo 42school c netwhat network networking norminette
Last synced: 14 days ago
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42 São Paulo - netwhat
- Host: GitHub
- URL: https://github.com/librity/ft_netwhat
- Owner: librity
- License: mit
- Created: 2021-02-21T21:20:48.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2022-02-25T10:51:34.000Z (over 4 years ago)
- Last Synced: 2025-11-19T02:03:45.088Z (7 months ago)
- Topics: 42, 42born2code, 42saopaulo, 42school, c, netwhat, network, networking, norminette
- Homepage: https://www.42sp.org.br/
- Size: 6.84 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
42 São Paulo - NetWhat?
Putting the FUN in networking fundamentals.
---
## 📜 Table of Contents
- [About](#about)
- [Notes](#notes)
- [42 São Paulo](#ft_sp)
- [References](#references)
- [Resources](#resources)
In this project we learn the basics of networking and th Internet Protocol.
Most of the questions use the IP calculator.
### TCP
TCP sends information to a single known host.
The information's integrity is pretty much guaranteed by extensive error-checking.
All packets arrive in order, and it's slower than UDP.
It's used by SMTP, HTTP, FTP and many others.
### UDP
UPD listens and broadcasts data to and from anything else that's broadcasting and listening.
The only error-checking it has is a checksum in each package.
It's used by DHCP (if you don't have an IP you can't use TCP), Voice over IP,
DNS, some streaming protocols, and more.
### DHCP
It's what assigns dynamic IPs to devices in a network.
Supports IPv4 and IPv6.
### ping
A common networking tool that checks if a host is turned on and connected. Uses ICMP.
### IP classes
Class A is the largest, with almost 17 million assignable IP addresses.
Used by very large organizations.
### Hosts in a Network
The ammount of assignable IPs in a subnet is always `pow(2, ip_bits_available) - 2`
### Network and Broadcast IPs
The Network IP address always ends with a 0.
The Broadcast IP address is always the last IP in the subnet.
Any package sent to the broadcast address relayed to all hosts in the subnet.
### DNS
It's a program running on a server somewhere that tells you which IP belongs to `google.com`.
You can talk to those servers with `nslookup`:
```bash
$ nslookup google.com
```
### Private IP
They all start with 192, 172 and 10.
Part of the larger [42 Network](https://www.42.fr/42-network/),
[42 São Paulo](https://www.42sp.org.br/) is a software engineering school
that offers a healthy alternative to traditional education:
- It doesn't have any teachers and classes.
- Students learn by cooperating
and correcting each other's work (peer-to-peer learning).
- Its focus is as much on social skills as it is on technical skills.
- It's completely free to anyone that passes its selection process -
[**The Piscine**](https://42.fr/en/admissions/42-piscine/)
It's an amazing school, and I'm grateful for the opportunity.
- [https://en.wikipedia.org/wiki/Private_IP](https://en.wikipedia.org/wiki/Private_IP)
- [https://en.wikipedia.org/wiki/OSI_model](https://en.wikipedia.org/wiki/OSI_model)
- [https://en.wikipedia.org/wiki/User_Datagram_Protocol](https://en.wikipedia.org/wiki/User_Datagram_Protocol)
- [https://en.wikipedia.org/wiki/Transmission_Control_Protocol](https://en.wikipedia.org/wiki/Transmission_Control_Protocol)
- [https://en.wikipedia.org/wiki/Ping\_(networking_utility)](https://en.wikipedia.org/wiki/Ping_%28networking_utility%29)
- [https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol](https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol)
- [https://www.meridianoutpost.com/resources/articles/IP-classes.php](https://www.meridianoutpost.com/resources/articles/IP-classes.php)
- [Private IP](https://whatismyipaddress.com/private-ip?__cf_chl_jschl_tk__=5b82b4f491407ec3c21c21de877c674ab747e579-1613940129-0-AWiz3zZF8QDWnRF0_vuiCAeZoCm1crquVe_N7ljLWW2854clNl-RxEzSU_HktAlZPFT4f7MValxzkzYvX3gdwa_D0-LXt5OgA56Kc7FRixHudg8ZVxZWUoKIYEEexYsZTcQrzBruxujERC-TzktMtvU3SJCbs1WRlCqSW0SfZK6Zu84i8_LdOEp5xOgHG-vYPKqLxrutUF7T2_RLiYO2IBD1VYdoKOvZ99PudLjuhV5sNbETrT7wOO4mudNyqmOK3JysgUbVs7nZh7knQKsNxnrDJgJK1GbJZPgEXfLoj5p7khCXrxqHaxA1Q8piIslMvpl08BCtm8R30iGRWG4kDiiKKuSZ9tNKqIDLSJh4XGWUSsV80g9v_6H14t3-hnVhDA)
- [https://www.lifewire.com/what-is-a-private-ip-address-2625970](https://www.lifewire.com/what-is-a-private-ip-address-2625970)
- [https://www.csestack.org/different-classes-of-ip-address/#Class_A](https://www.csestack.org/different-classes-of-ip-address/#Class_A)
- [https://www.youtube.com/c/ippsec/videos](https://www.youtube.com/c/ippsec/videos)
- [https://github.com/appinha/42cursus/tree/master/01-netwhat](https://github.com/appinha/42cursus/tree/master/01-netwhat)
- [https://github.com/lucasnfarias/42Cursus/blob/master/netwhat/NETWHAAAAAAAAAAAAAAAT\_.pdf](https://github.com/lucasnfarias/42Cursus/blob/master/netwhat/NETWHAAAAAAAAAAAAAAAT_.pdf)
### Testers
- [https://github.com/adblanc/netwhat42-train](https://github.com/adblanc/netwhat42-train)
- [https://github.com/appinha/42cursus/tree/master/01-netwhat](https://github.com/appinha/42cursus/tree/master/01-netwhat)
### IP Mask Calculators
- [http://jodies.de/ipcalc?host=192.168.0.1&mask1=24&mask2=](http://jodies.de/ipcalc?host=192.168.0.1&mask1=24&mask2=)
- [https://github.com/appinha/ip_calc-netwhat-42cursus](https://github.com/appinha/ip_calc-netwhat-42cursus)