This paper describes a framework for constructing network services for accessing media objects. The framework, called end-to-end media paths, provides a new approach for building multimedia applications from component pieces. Based on input from the user and resource requirements from the media

We investigate the problem of identifying individual link metrics in a communication network from end-to-end path measurements, under the assumption that link metrics are additive and constant. To uniquely identify the link metrics, the number of linearly independent measurement paths must equal

Replicating content across a geographically distributed set of servers and redirecting clients to the closest server in terms of latency has emerged as a common paradigm for improving client performance. In this paper, we analyze latencies measured from servers in Google’s content distribution network (CDN) to clients all across the Internet to study the effectiveness of latency-based server selection. Our main result is that redirecting every client to the server with least latency does not suffice to optimize client latencies. First, even though most clients are served by a geographically nearby CDN node, a sizeable fraction of clients experience latencies several tens of milliseconds higher than other clients in the same region. Second, we find that queueing delays often override the benefits of a client interacting with a nearby server. To help the administrators of Google’s CDN cope with these

This paper explores the feasibility of improving the performance of end-to-end data transfers between different sites through path switching. Our study is focused on both the logic that controls path switching decisions and the configurations required to achieve sufficient path diversity

This paper explores the feasibility of improving the performance of end-to-end data transfers between different sites through path switching. Our study is focused on both the logic that controls path switching decisions and the configurations required to achieve sufficient path diversity

Abstract—In this paper, we propose new “low-overhead” network monitoring techniques to detect violations of path-level QoS guarantees like end-to-end delay, loss, etc. Unlike existing path monitoring schemes, our approach does not calculate QoS parameters for all paths. Instead, it monitors Qo

Abstract—In this paper, we propose new “low-overhead” network monitoring techniques to detect violations of path-level QoS guarantees like end-to-end delay, loss, etc. Unlike existing path monitoring schemes, our approach does not calculate QoS parameters for all paths. Instead, it monitors Qo

This paper presents the bottlenecks currently limiting the transfer speeds of astronomical data from radio telescopes across the world over high speed links to the central processing centre in the Netherlands. The processed data is used to produce images which are used by radio astronomers. The image sensitivity of continuum observations scales with the data rate, so the higher the data rate, the more sensitive these observations will be. The required high data rates should be attainable on these network links, however it is not the case. The aim of our study was therefore to uncover the prevailing bottlenecks and propose solutions to address them. The bottlenecks were identified by conducting data transfer tests over these links under various network condition. We also provide an explanation for the existing bottlenecks as well as potential solutions to overcome them.

What is Routing? • Routing: Routing refers to the process of choosing a path over which to send packets.(source to destination) • desirable properties: correctness, simplicity, robustness, stability, fairness, optimality • what optimize? – Mean packet delay – network throughput

more or fewer resources. In particular, the distributed system consists of collections of time-constrained and precedence- onstrained applications that communicate and work together to form a pipeline, or path, which is divided into subpaths. The QoS manager monitors these subpaths in order to diagnose