---
# System prepended metadata

title: Module 7-9 - Network Functions and Equipment
tags: [Module 7-9, __ccna_EN]

---

---
title:  Module 7-9 - Network Functions and Equipment
---

###### tags: `__ccna_EN`,`Module 7-9`

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

Introduction to describe network functions and equipment


**Switch Functions**![](https://i.imgur.com/Pk0tR1U.png)


Receives Data "Packets" (Frames) and directs them to their destination
send data though port. 

* connects cables (copper cables / optic cables)
* learns MAC addresses (cam table)
* Forwards or floods data

![](https://i.imgur.com/9N49k0Q.png)


**Primacy Wireless access point functions WAP**

Communicate Data Packets (Frames) Wirelessly over 2.4 and 5 Ghz Radio Frequencies
Tran smits across RF channels (radio frenquencies)

wifi standards 802.11 a/g/n ect/..
nouveau standard WIFI 6 (802.11ax)


**Primary router functions**

Control broadcasts and forward directed data packets between networks
-Contains network "chatter"
-Relies on ip-bases routing table
-Acts as a "Gateway" between network types


MDF = Main distribution facilities (salle serveur ou baie de brassage)
idf = intermediate distribution fa



OSI MODEL - Transport layer
UDP - unreliable, fast (streaming, voip, video game)
TCP - reliable

Ports - it s the bridge between Transport Layer and App layer


# Models of architecture
![](https://i.imgur.com/GVVnXCz.png)
## Two tier layer
-Collapsed core
-single point of failure
-stack of switch -> modular network switch

![](https://i.imgur.com/QJGBqE4.png)


Why Two tier layer = redonduncy


![](https://i.imgur.com/8Wfqi0X.png)


Why tree tier layer
![](https://i.imgur.com/dSUDk3Z.png)
![](https://i.imgur.com/ZIaIQL5.png)


</br></br></br>

# Spine-leaf architecture = Designed to Datacenter
east-weast Architecture
Eliminate traditionnal bottleneck

SLA = Service level agreament => garanty that's we are online (internet access)

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



# WAN ARCHITECTURE
![](https://i.imgur.com/deRp590.png)


Data connection
Lease Line

MPLS ot METROE
Packect Switched
virtual socket
![](https://i.imgur.com/KcB7iy5.png)
![](https://i.imgur.com/eQxbUAB.jpg)
Multiprotocol Label Switching (MPLS) is a routing technique in telecommunications networks that directs data from one node to the next based on short path labels rather than long network addresses, thus avoiding complex lookups in a routing table and speeding traffic flows.
https://searchnetworking.techtarget.com/definition/Multiprotocol-Label-Switching-MPLS
https://en.wikipedia.org/wiki/Multiprotocol_Label_Switching#Role_and_functioning
![](https://i.imgur.com/pyDjavV.png)
![](https://i.imgur.com/SQBm5s9.png)

Example of MetroE
![](https://i.imgur.com/DX6GQwj.png)



Internet 
Dialup modem
circuit switched
VPN connection

# SOHO Small Office/Home office environnement

Goal -Save lots of money/time with the SOHO.
Critere of prerequies for each office
    Level of redundacy
    Type of internet (VPN / PSTN or MPLS)

In big Compagny there are Template for the SOHO.
![](https://i.imgur.com/DeEB3tw.png)


# On Premise vs Cloud Architecture vs Hybrid
store & access ressources diff.
![](https://i.imgur.com/F6MHr5f.png)

Public cloud = off 365 / google store / aws
Private cloud = private Datacenter
On premise = Ad / Print server

Diff between public/private cloud
Public= azure ad 
Azure designed for ad user db + Maintenaing microsoft systeme
replicate between them in order to keep a copy / PRA




Excercice
![](https://i.imgur.com/4umTaxI.png)

Draw infrastructure





![](https://i.imgur.com/7bSEf0F.jpg)

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



## Question
autnomous in one SOHO
Lighweight (controller-based) when an administrator have to administrate a lots of Soho 
![](https://i.imgur.com/DX0wlSz.png)


co-location => Our serveur/network resources in a private
public cloud => the stuff isn't ours
![](https://i.imgur.com/jtP7hUt.png)

