Réseaux
226 documents à télécharger gratuitement
Cours, examens, TD, TP et exercices de réseaux. Thèmes couverts : TCP/IP, routage, Cisco, VLAN, administration réseau.
This document discusses the concept of service primitives in layered architecture. It provides a correction for exercise number 2, focusing on a simple connection service example between two entities. Additionally, it lists 12 service primitives related to this model.
This document includes exercises on perceptrons focusing on linearly separable sets and learning parity from a seven-segment display. It presents initial weight settings and input samples for training. The material is structured over multiple slides with visual aids.
This document explores the foundations of neural networks, drawing inspiration from the biological nervous system. It introduces key components such as neurons, synapses, and dendrites, explaining how signals are processed and transmitted. The text elaborates on the concept of artificial neurons, discusses the perceptron learning algorithm, and extends to hidden-layer networks for complex problems. Advantages like flexibility and non-linear modeling are highlighted alongside limitations, including sensitivity to noise, overfitting, and the need for continuous updates with new data.
This document covers the fundamentals of neural networks, exploring both biological and artificial neurons. It explains the structure and functions of neurons and introduces the concept of weighted graphs as models for neural networks. Additionally, the document discusses the process of learning through the reinforcement of connections in response to stimuli.
This document provides a comprehensive explanation of the client/server architecture, emphasizing the cooperative interaction between clients and servers. It delves into the use of the TCP/IP protocol stack and the Berkeley Sockets API for creating networked applications. Detailed descriptions and algorithms are provided for programming single-client and multi-client servers, along with socket operations like creation, communication, and closure. Debugging techniques, such as using netstat and telnet, are also covered to manage and inspect network connections effectively.
This document, an advanced examination titled 'Devoir N°2,' focuses on networking and system programming concepts. It emphasizes clarity in responses while testing specific technical knowledge, such as the definitions of RPC and socket descriptors, and includes practical programming exercises, like creating programs for command-line interactions and managing inter-process communication. The methodology relies heavily on problem-solving to assess core concepts, and the findings aim to determine mastery in system-level programming and standard network procedures.
The document covers essential fundamentals of subnetting and routing tables in networking. It calculates subnet distributions, including the number of subnets and the corresponding IP address ranges while utilizing subnet masks. Routing tables are examined for two different routers, showing routes and next hops for various destination networks. The document focuses on practical application and calculations for networking scenarios.
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 outlines network-related exercises focusing on subnetting, CIDR-based address allocation, and routing algorithms. The exercises include designing a scalable network for an organization with up to 200 devices, subnet division, and implementing routing protocols like Dijkstra and Distance Vector. Key methods discussed involve computations for routing tables and iterative message-passing for simulated network topologies. It aims to build theoretical knowledge and practical application skills for network configuration and optimization.
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.