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# System prepended metadata

title: Module 15 & 16

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---
title: Module 15 & 16
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# Introduction TCP / UDP Communication

## TCP session
  
  
  ![](https://i.imgur.com/5vF2huw.png)
 
 Use of == and &&
 
 ![](https://i.imgur.com/uf1yV1R.png)


![](https://i.imgur.com/jb4YW9V.png)

## HOW TCP Communicates (windowing)

win = number
windowing automatic process

![](https://i.imgur.com/FFSQeiL.png)


# end of tcp session
PSH Fin de transfert d'un echange
FIN Fin d'une conversation entre src et destinataire (closing gracefully)
RST Fin d'une communication anormal
    Network Congestion
    procession memory trouble
    Security paquet (too much request in the same time)
 ![](https://i.imgur.com/5H1NEGD.png)


# How udp communicates


# MODULE 16
BROADCAST ADDRESS = Tous les bits d'hôte à 1.
Domaine de diffusion sur la couche 2 = Broadcast = Network

STP: Définit 1 rôle sur le port root /// Bloque 1 ou pls ports 
Bloquer un port permet de supprimer les tempêtes de diffusion (BroadcastStorm)
![](https://i.imgur.com/pjlCrVv.png)


Concaténation sous cisco ios
![](https://i.imgur.com/LHxssyx.png)


Labs
Show mac address | fd1a         
![](https://i.imgur.com/ZDgxH4Y.png)

![](https://i.imgur.com/A8JaiXR.png)

![](https://i.imgur.com/0U2jxu8.png)


Table
![](https://i.imgur.com/alXz6I5.png)


Name -> @IP
![](https://i.imgur.com/4Y4RiQz.png)

|



Configuration Fullduplex + Speed
![](https://i.imgur.com/RzazxZ0.png)

![](https://i.imgur.com/DfMkpgr.png)
