Learn More
Network-analysis literature is rich in node-centrality measures that quantify the centrality of a node as a function of the (shortest) paths of the network that go through it. Existing work focuses on defining instances of such measures and designing algorithms for the specific combinato-rial problems that arise for each instance. In this work, we propose a(More)
As the Internet has evolved and grown, an increasing number of nodes (hosts or autonomous systems) have become mul-tihomed, i.e., a node is connected to more than one network. Mobility can be viewed as a special case of multihoming— as a node moves, it unsubscribes from one network and subscribes to another, which is akin to one interface becoming inactive(More)
Increasingly, commercial content providers (CPs) offer streaming and IPTV solutions that leverage an underlying peer-to-peer (P2P) stream distribution architecture. The use of P2P protocols promises significant scalability and cost savings by leveraging the local resources of clients -- specifically, uplink capacity. A major limitation of P2P live streaming(More)
—Leveraging client upload capacity through peer-assisted content distribution was shown to decrease the load on content providers, while also improving average distribution times. These benefits, however, are limited by the disparity between client upload and download speeds, especially in scenarios requiring a minimum distribution time (MDT) of a piece of(More)
Infrastructure as a Service pricing models for resources are meant to reflect the operational costs and profit margins for providers to deliver virtualized resources to customers subject to an underlying Service Level Agreements (SLAs). While the operational costs incurred by providers are dynamic – they vary over time depending on factors such as energy(More)
Network virtualization provides a novel approach to running multiple concurrent virtual networks over a common physical network infrastructure. From a research perspective, this enables the networking community to concurrently experiment with new Internet architectures and protocols. From a market perspective, on the other hand, this paradigm is appealing(More)
—Desirable application performance is typically guaranteed through the use of Service Level Agreements (SLAs) that specify fixed fractions of resource capacities that must be allocated for unencumbered use by the application. The mapping between what constitutes desirable performance and SLAs is not unique: multiple SLA expressions might be functionally(More)
—By colocating with other tenants of an Infrastructure as a Service (IaaS) offering, IaaS users could reap significant cost savings by judiciously sharing their use of the fixed-size instances offered by IaaS providers. This paper presents the blueprints of a Colocation as a Service (CaaS) framework. CaaS strategic services identify coalitions of(More)
As the Internet has evolved and grown, an increasing number of nodes (hosts or autonomous systems) have become multihomed, i.e., a node is connected to more than one network. Mobility can be viewed as a special case of multihoming—as a node moves, it unsubscribes from one network and subscribes to another , which is akin to one interface becoming inactive(More)
In many information networks, data items – such as updates in social networks, news flowing through interconnected RSS feeds and blogs, measurements in sensor networks, route updates in ad-hoc networks – propagate in an uncoordi-nated manner: nodes often relay information they receive to neighbors, independent of whether or not these neighbors received the(More)