Réseaux
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Cours, examens, TD, TP et exercices de réseaux. Thèmes couverts : TCP/IP, routage, Cisco, VLAN, administration réseau.
This document details a computer networks exam focused on subnetting and IP routing. It provides problems to calculate subnet masks, analyze IP addresses, and determine broadcast addresses for specific scenarios. Another set of exercises involves creating routing tables for given stations and routers in a predefined topology. The exam emphasizes practical application of network address manipulation and understanding routing mechanisms.
This document discusses key concepts in computer networking, particularly focusing on the CSMA access method and its implementation in LANs with a bus topology. Detailed calculations regarding network transmission time, propagation delay, and coverage limits are provided, alongside a breakdown of Ethernet frame structure. The document also references IEEE 802.3 standards and examines the use of coaxial cables with a 100 Mbps data rate.
The document evaluates student knowledge of foundational Ethernet principles and networking protocols. It covers topics such as CSMA/CD mechanisms, Ethernet frame formatting, and configurations for interconnecting networks in practical scenarios. Calculations are required to determine trame length and maximum network coverage based on technical specifications. Solutions consider material and cabling for network scalability in a multi-floor setup.
This document serves as a practical tutorial on Ethernet networks, addressing critical aspects such as MAC frame structures, collision handling in CSMA/CD, and the use of VLANs for network segmentation. It includes exercises covering Ethernet topology, transmission delays, and effective throughput, while exploring media types and their respective characteristics. The document also provides practical case studies for building and extending network architectures, including transitioning from shared to switched Ethernet environments.
The document details a project aimed at resolving issues with the existing STEG web architecture, such as lack of security, supervision, and availability. Using PFsense and its integrated tools (HAproxy, Snort), the author implemented a secure, load-balanced solution. Additionally, Cacti was used for network supervision, enabling monitoring of traffic, CPU usage, and automated alert systems. The proposed solutions ensure high availability, improved security, and effective monitoring of web services.
This project focuses on developing a high-availability web architecture supervision solution for the Tunisian Electricity and Gas Company (STEG). The research identified several issues with the existing system, such as insecure data and non-ergonomic interfaces. The proposed solution involves implementing a user-friendly MVC architecture, utilizing tools like Cacti for monitoring and an architecture employing supervision software to ensure optimal availability and security. The project resulted in a functional CRM system with future scope for improved application design and deployment.
Ce document présente un atelier visant à la mise en place d'un système de détection d'intrusion (IDS) avec Snort. Il décrit les étapes d'installation, de configuration et d'utilisation de Snort ainsi que des outils associés comme Nmap et ACID. L'objectif est d'apprendre à sécuriser les réseaux informatiques à travers des exercices pratiques.
L E MOBILE : U NE HISTOIRE DE GÉNÉRATION ○ 1983: La 1G : C’est l’ancien Radiocom 2000 de France Télécom. (Modulation analogiques ) ○ 1988: Réseaux cellulaire numérique GSM : 2G European (services offerts: voix et SMS ) ○ 1990: IEEE 802.
W IRELESS LAN (WLAN) D finition : Un r seau d'ordinateurs et de mat riels sans fil qui offre les fonctionnalit s des r seaux locaux LAN traditionnels (Ethernet), mais en utilisant une technologie sans fil .
P LAN Emplacement dans le mod le OSI R le de la couche liaison Organisation de la couche liaison : LLC, MAC Exemple de protocole de la couche liaison : Ethernet (r seau local) Service tramage Adressage MAC Service contr le de flux Service acc s canal 2 A RCHITECTURE ET PROTOCOLES R SEAUX Chapitre 4: Les r seaux locaux: le protocole Ethernet Dr.
P LAN ○ Routage statique ○ Routage statique par défaut ○ Routage dynamique: RIP 2 A RCHITECTURES ET PROTOCOLES RÉSEAUX Chapitre 3: La couche réseau: le routage Dr.
Format des trames Ethernet Pain-Barre IUT INFO Ann e 2007-2008 1 Introduction Ethernet est un r seau diffusion d velopp l origine par les soci t s Xerox, Intel et Digital Equipment.
Comptes Rendus des TPs Re seaux TP : TP 1 D ploiement de r seaux IP sous Linux et MS Windows TP 2 Partage d une connexion en utilisant SQUID & IPTABLES TP 3 D ploiement des services DHCP et DNS TP 4 D ploiement de r seaux IP sous IOS Cisco TP 5 Configuration de LANs & Interconnexion de niveau 2sous IOS Cisco 2012/2013 TP D ploiement de r seaux IP sous Linux et MS Windows Objectifs : - Configuration d adresses IP statiques.
ECUE : Fondement des R seaux Chapitre 1 : Notion de base en r seaux Introduction La notion r seau est une notion assez vague et en vogue aujourd hui. Un r seau n est qu un ensemble d ordinateurs et de p riph riques reli s entre eux dans le but d changer des donn es.
This technical project revolves around the deployment of PfSense, a BSD-based firewall solution, combined with Squid and SquidGuard for URL filtering in HTTP and HTTPS traffic within a simulated virtualized environment. A VirtualBox setup hosts two virtual machines—a PfSense firewall server and a Windows 7 client—to establish internet filtering on specified categories like social networks and sports sites. Methodologies include the creation of internal certificates, implementation of Squid proxy transparent filtering, and SquidGuard for blacklists. Final testing validates successful filteri...
The document centers around perceptron algorithms through exercises demonstrating linear and parity-based learning. Exercise 1 involves a dataset with instances linearly separable by the equation y=x/2 and alternating set presentations for weight adjustments initialized at zero. Exercise 2 introduces a parity problem using a seven-segment display, classifying digits based on even-odd parity. The content emphasizes algorithmic learning and practical implementation steps.
The document provides a thorough taxonomy of security concepts, focusing on UNIX system security, network architecture, and log analysis. Key methodologies include preventive and reactive measures against threats targeting confidentiality, integrity, and availability. It introduces tools like Snort, TCPdump, and Syslog for intrusion detection and log analysis. Detailed descriptions of attack classifications (Probing, R2L, U2R, DoS) and defense strategies (firewalls, IDS) are presented alongside step-by-step techniques for understanding and analyzing log files.
Ce document aborde la sécurisation des réseaux, en mettant l'accent sur l'utilisation des pare-feu (firewall), des systèmes de détection et de prévention d'intrusion (IDS/IPS), et des réseaux privés virtuels (VPN). Il explique les différentes catégories de pare-feu, ainsi que leur fonctionnement et leurs limites. De plus, il présente les protocoles de tunneling utilisés pour sécuriser les échanges de données.
Le Centre de Carrière de l’ESEN a pour mission d’améliorer l’employabilité des futurs diplômés ESENIENS. Cette mission est réalisée à travers quatre axes principaux : Information sur les métiers, Accompagnement en Insertion Professionnelle, Formations et Certifications, et Ouverture sur l’Environnement. Le Comité de Pilotage inclut toute la communauté ESEN, comprenant enseignants, administration, étudiants et partenaires.
Ce document traite des principes de codage et transmission de l’information dans les réseaux. Il aborde les problèmes de transmission, les perturbations affectant les signaux et les caractéristiques des supports de transmission. Des solutions aux problèmes de déformation du signal sont également discutées.
Ce document traite du modèle en couches OSI, qui est essentiel pour la transmission de données sur les réseaux informatiques. Il aborde la nécessité d'une structuration en couches pour réduire la complexité et améliorer l'interopérabilité des technologies. Le texte fournit également des descriptions détaillées des différentes couches du modèle et de leurs fonctions.
This document provides step-by-step instructions for setting up a secondary DNS server on CentOS 7. The methodology includes configuring the named.conf file to define trusted clients and zone files to establish slave zones aligned with master zones on the primary DNS server. Validation is performed using the named-checkconf command, followed by starting and enabling the BIND service for DNS resolution. The implementation ensures private DNS servers are used for network name and IP resolution, with client testing performed via dig commands.
This document details the step-by-step methodology for configuring the BIND DNS server on CentOS 7 to function in a private network. It includes setup instructions for both primary and secondary DNS servers, example configurations for forward and reverse zones, and validation steps using tools like nslookup. The document further explains best practices for ACLs, zone definitions, and client configuration to ensure controlled recursive queries. Finally, it provides guidance on troubleshooting syntax errors and validating zone correctness.
This document provides a detailed step-by-step guide for setting up CentOS 7, including configuring predictable network interface names, assigning static IP addresses, disabling IPv6, manipulating firewall settings, and adjusting SELinux configurations. Key methodologies involve editing configuration files, using command-line utilities like 'nmcli' and 'systemctl', and rebooting to apply changes. It emphasizes disabling unnecessary services such as firewalls and SELinux for specific lab environments. The underlying goal is to establish a streamlined, secure, and functional CentOS 7 environm...