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

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

reminder

Introduction to describe network functions and equipment

**Switch Functions**

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


**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
## Two tier layer
-Collapsed core
-single point of failure
-stack of switch -> modular network switch


Why Two tier layer = redonduncy


Why tree tier layer

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

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


# WAN ARCHITECTURE

Data connection
Lease Line

MPLS ot METROE
Packect Switched
virtual socket
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

Example of MetroE

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.

# On Premise vs Cloud Architecture vs Hybrid
store & access ressources diff.

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

Draw infrastructure



## Question
autnomous in one SOHO
Lighweight (controller-based) when an administrator have to administrate a lots of Soho

co-location => Our serveur/network resources in a private
public cloud => the stuff isn't ours