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Mourad ELGORMA posted in the group Network engineers
OSI Layer 2: Data Link Layer
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$$f(t) = \mathcal{F}^{-1}\{F(\omega)\} = \frac{1}{2\pi} \int_{-\infty}^{\infty} F(\omega) e^{i \omega t} \, d\omega$$
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Un VLAN (Virtual Local Area Network) est un réseau local virtuel qui permet de segmenter un réseau physique en plusieurs sous-réseaux logiques. Il fonctionne au niveau 2 du modèle OSI (couche liaison de données) et permet d’isoler des groupes d’appareils, même s’ils sont connectés à la même infrastructure physique (comme un switch).
Po…Read More
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18 Essential Network Ports: A Must-Know Guide for Secure and Efficient IT Operations
FTP (File Transfer Protocol) – TCP/21
Purpose: Used for transferring files between clients and servers.SSH (Secure Shell) – TCP/22
Purpose: Provides a secure channel for remote login and command execution.Telnet – TCP/23
Purpose: Offers unenc…Read More -
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