Net:Geography Fieldwork Frequently Asked Questions

Abstract included in text

Survey of End-to-End Mobile Network Measurement Testbeds, Tools, and Services

Mobile (cellular) networks enable innovation, but can also stifle it and lead to user frustration when network performance falls below expectations. As mobile networks become the predominant method of Internet access, developer, research, network operator, and regulatory communities have taken an increased interest in measuring end-to-end mobile network performance to, among other goals, minimize negative impact on application responsiveness. In this survey we examine current approaches to end-to-end mobile network performance measurement, diagnosis, and application prototyping. We compare available tools and their shortcomings with respect to the needs of researchers, developers, regulators, and the public. We intend for this survey to provide a comprehensive view of currently active efforts and some auspicious directions for future work in mobile network measurement and mobile application performance evaluation.Comment: Submitted to IEEE Communications Surveys and Tutorials. arXiv does not format the URL references correctly. For a correctly formatted version of this paper go to http://www.cs.montana.edu/mwittie/publications/Goel14Survey.pd

ELASTICITY: Topological Characterization of Robustness in Complex Networks

Just as a herd of animals relies on its robust social structure to survive in the wild, similarly robustness is a crucial characteristic for the survival of a complex network under attack. The capacity to measure robustness in complex networks defines the resolve of a network to maintain functionality in the advent of classical component failures and at the onset of cryptic malicious attacks. To date, robustness metrics are deficient and unfortunately the following dilemmas exist: accurate models necessitate complex analysis while conversely, simple models lack applicability to our definition of robustness. In this paper, we define robustness and present a novel metric, elasticity- a bridge between accuracy and complexity-a link in the chain of network robustness. Additionally, we explore the performance of elasticity on Internet topologies and online social networks, and articulate results

Prueba de habilidades práctica CISCO CCNP

Cisco Packet Tracer de Cisco es un programa de simulación de redes que permite a los estudiantes experimentar con el comportamiento de la red y resolver preguntas del tipo «¿qué pasaría si...?» La versión actual soporta un conjunto de Protocolos de capa de aplicación simulados, al igual que enrutamiento básico con RIP, OSPF, y EIGRP.. Aunque Packet Tracer provee una simulación de redes funcionales, utiliza solo un pequeño número de características encontradas en el hardware real corriendo una versión actual del Cisco IOS. Packet Tracer no es adecuado para redes en producción. En este programa se crea la topología física de la red simplemente arrastrando los dispositivos a la pantalla. Luego haciendo clic sobre ellos se puede ingresar a sus consolas de configuración. Allí están soportados todos los comandos del Cisco IOS e incluso funciona el "tab completion". Una vez completada la configuración física y lógica de la red, también se pueden hacer simulaciones de conectividad (pings, traceroutes) todo ello desde las mismas consolas incluidas. Una de las grandes ventajas de utilizar este programa es que permite "ver" (opción "Simulation") cómo deambulan los paquetes por los diferentes equipos (switches, routers, PC’s), además de poder analizar de forma rápida el contenido de cada uno de ellos en las diferentes capas y datos.Cisco's Cisco Packet Tracer is a network simulation program that allows students to experiment with network behavior and solve "what if ...?" Questions. The current version supports a set of network layer protocols. simulated application, as well as basic routing with RIP, OSPF, and EIGRP. Although Packet Tracer provides a simulation of functional networks, it uses only a small number of features found in real hardware running a current version of Cisco IOS. Packet Tracer is not suitable for networks in production. In this program, the physical topology of the network is created by simply dragging the devices to the screen. Then clicking on them you can enter their configuration consoles. There all Cisco IOS commands are supported and even "tab completion" works. Once the physical and logical configuration of the network is complete, you can also do connectivity simulations (pings, traceroutes) all from the same consoles included. One of the great advantages of using this program is that it allows you to "see" (option " Simulation ") how packets roam through different equipment (switches, routers, PCs), in addition to being able to quickly analyze the contents of each of them in the different layers and data