#+title: Class notes


* class 1 /sun sep 17 13:04:43 2023/
** Les Reseaux locaux (LAN)
Cable 10 mbps ou moins = Ethernet
Cable 100 mbps = Fast Ethernet
Cable 1000 mbps ou plus = Giga Ethernet

** MAC Address :
First three Bytes : vendor
Last three Bytes : Unique ID
(In Hexadecimal)

TODO: CSMA/ CA CD

** RJ-45 connecteurs
**** Straight
**** Crossover (croisé)
**** Rollover (console)

** IPV4 classes :
- Classe A : 0 - 127  /8
  - 0.0.0.0/0 : route par default
  - 127.0.0.0/8 : bouclage
- Classe B : 128 - 191  /16
  - 169.254.0.0/16 : APIPA
- Classe C : 192 - 223  /24
- Classe D : 224 - 239
  - Multicast
- Classe E : 240 - 255

** Adresses privées:
- Classe A : 10.0.0.0 - 10.255.255.255 /8
- Classe B : 172.16.0.0 - 172.31.255.255 /12
- Classe C : 192.168.0.0 - 192.168.255.255 /16


8   7   6   5   4   3   2   1
128 64  32  16  8   4   2   1
256 128 64  32  16  8   4   2
/24 /25 /26 /27 /28 /29 /30 /31

500
150
60
30
20
15
** 500 hosts :

Addresse: 10.0.0.0 /23

500 - 256 = 244

First IP : 10.0.0.1 /23
Last IP : 10.0.1.254 /23
@B IP : 10.0.1.255 /23
Mask : 255.255.254.0

** 150 hosts :

Addresse: 10.0.2.0 /24
First IP: 10.0.2.1 /24
Last IP: 10.0.2.254 /24
@B IP: 10.0.2.255 /24
Mask: 255.255.255.0

** 60 hosts :
Addresse: 10.0.3.0 /26
First IP: 10.0.3.1 /26
Last IP: 10.0.3.63 /26
@B IP: 10.0.3.64 /26
Mask: 255.255.255.191

** 30 hosts:
 Addresse: 10.0.3.63/8
 First IP: 10.0.3.64/8
 Last IP: 10.0.3.96/8
 @B IP: 10.0.3.97/8
 Mask: 255.255.255.158/11

** 20
Addresse: 10.0.3.97/8
First IP: 10.0.3.98/8
Last IP: 10.0.3.128/8
@B IP: 10.0.3.129/8
Mask: 255.255.255.126/11
** 15
Addresse: 10.0.3.129/8
First IP: 10.0.3.130/8
Last IP: 10.0.3.144/8
@B IP: 10.0.3.145/8
Mask: 255.255.255.110/12

* Class 2Sun /Sep 24 09:09:28 2023/
** CCTV (finally)