摘要 :
Data centers are experiencing a remarkable growth in the number of interconnected servers. Being one of the foremost data center design concerns, network infrastructure plays a pivotal role in the initial capital investment and as...
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Data centers are experiencing a remarkable growth in the number of interconnected servers. Being one of the foremost data center design concerns, network infrastructure plays a pivotal role in the initial capital investment and ascertaining the performance parameters for the data center. Legacy data center network (DCN) infrastructure lacks the inherent capability to meet the data centers growth trend and aggregate bandwidth demands. Deployment of even the highest-end enterprise network equipment only delivers around 50% of the aggregate bandwidth at the edge of network. The vital challenges faced by the legacy DCN architecture trigger the need for new DCN architectures, to accommodate the growing demands of the 'cloud computing' paradigm. We have implemented and simulated the state of the art DCN models in this paper, namely: (a) legacy DCN architecture, (b) switch-based, and (c) hybrid models, and compared their effectiveness by monitoring the network: (a) throughput and (b) average packet delay. The presented analysis may be perceived as a background benchmarking study for the further research on the simulation and implementation of the DCN-customized topologies and customized addressing protocols in the large-scale data centers. We have performed extensive simulations under various network traffic patterns to ascertain the strengths and inadequacies of the different DCN architectures. Moreover, we provide a firm foundation for further research and enhancement in DCN architectures.
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Optical systems and technologies have been radically changing the telecommunication networks for past 15 years; today wavelength division multiplexing (WDM) technology, optical amplifiers, and simple optical switching elements lik...
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Optical systems and technologies have been radically changing the telecommunication networks for past 15 years; today wavelength division multiplexing (WDM) technology, optical amplifiers, and simple optical switching elements like optical add-drop multiplexers (OADMs) are used in the backbone networks of all operators worldwide. Optical systems nowadays provide the basis for cost-effective transmission of large amounts of bandwidth over the Internet, and will enable its future growth and the spreading of new applications and services. This paper summarizes the main trends in optical networking and investigates potential future application areas. Optical system technology has become so pervasive in network design that it needs to be considered in the context of provisioning new applications and services. Therefore, the analysis is not limited to the aspects of physical transmission, but also takes into account recent developments in integrated network design as well as network control and management. The following sections describe the key functionalities of future optical network architectures, and the key findings of the theoretical analysis are supported by the results of a field trial of advanced transmission technology.
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Several recent studies have shown that router FIB caching offers excellent hit rates with cache sizes that are an order of magnitude smaller than the original forwarding table. However, hit rate alone is not sufficient - other per...
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Several recent studies have shown that router FIB caching offers excellent hit rates with cache sizes that are an order of magnitude smaller than the original forwarding table. However, hit rate alone is not sufficient - other performance metrics such as memory accesses, robustness to cache attacks, queuing delays from cache misses, etc., should be considered before declaring FIB caching viable.
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摘要 :
Some of the challenges of developing and maturing a future internet architecture (FIA) are described. Based on a talk given at the Conference on Future Internet Technologies 2013.
摘要 :
Redeployment of decentralized nodes in xG access networks becomes necessary when there are disruptions to availability and accessibility for communications. This article proposes a priority-based node redeployment algorithm with m...
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Redeployment of decentralized nodes in xG access networks becomes necessary when there are disruptions to availability and accessibility for communications. This article proposes a priority-based node redeployment algorithm with minimum availability assurance. A set of nodes are selected from the access network to function as a core network. The decentralized nodes are considered subnetworks which seeks one-hop connectivity to the aforementioned core network. Prior information of a core network structure is necessary to ensure minimum availability. The proposed solution is suitable for decentralized xG access network architectures which demands a minimum availability requirement and maximum possible core node selection in spite of restructuring the network due to redeployment.
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摘要 :
By a News Reporter-Staff News Editor at Network Daily News – According to
news reporting based on a preprint abstract, our journalists obtained the following quote sourced from
biorxiv.org:
“The walking system of the stick in...
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By a News Reporter-Staff News Editor at Network Daily News – According to
news reporting based on a preprint abstract, our journalists obtained the following quote sourced from
biorxiv.org:
“The walking system of the stick insect is one of the most thoroughly described invertebrate systems.
“We know a lot about the role of sensory input in the control of stepping of a single leg. “However, the neuronal organization and connectivity of the central neural networks underlying the
rhythmic activation and coordination of leg muscles still remain elusive. It is assumed that these networks
can couple in the absence of phasic sensory input due to the observation of spontaneous recurrent patterns
(SRPs) of coordinated motor activity equivalent to fictive stepping-phase transitions.
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摘要 :
The hourglass concept has been undisputable ruler of networking visions on the last years. As network evolution is now a hot topic, this article aims to reflect on this concept, highlighting its current shortcomings, and suggesting its evolution.
摘要 :
Network architectures are a unique artifact of computer science. They are shaped by both technical and non-technical forces. When well-crafted, they define fixed points that catalyze innovation. And they ultimately suffer from ent...
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Network architectures are a unique artifact of computer science. They are shaped by both technical and non-technical forces. When well-crafted, they define fixed points that catalyze innovation. And they ultimately suffer from entropy and need to be reinvented. Drawing on my experiences building and operating network research testbeds, designing and deploying experimental network services, transferring research prototypes to the commercial sector, and witnessing fundamental shifts in the networking industry, this talk explores the nature of network architectures. It also attempts to extract a set of general lessons, and apply them to the emerging cloud.
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摘要 :
By a News Reporter-Staff News Editor at Network Daily News – According
to news reporting based on a preprint abstract, our journalists obtained the following quote sourced from
biorxiv.org:
“Architecture of species interactio...
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By a News Reporter-Staff News Editor at Network Daily News – According
to news reporting based on a preprint abstract, our journalists obtained the following quote sourced from
biorxiv.org:
“Architecture of species interaction networks is a key factor determining stability of ecological communities.
“However, the fact that ecological network architecture can change through time is often overlooked
in discussions on community-level processes despite its theoretical importance. By compiling a time-series
community dataset involving 50 spider species and 974 Hexapoda prey species/strains, we quantified the
extent to which architecture of predator-prey interaction networks can shift across time points.
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摘要 :
By a News Reporter-Staff News Editor at Network Daily News – According
to news reporting based on a preprint abstract, our journalists obtained the following quote sourced from
biorxiv.org:
“The ongoing activity of neuronal p...
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By a News Reporter-Staff News Editor at Network Daily News – According
to news reporting based on a preprint abstract, our journalists obtained the following quote sourced from
biorxiv.org:
“The ongoing activity of neuronal populations represents an internal brain state that influences how
sensory information is processed to control behaviour. Conversely, external sensory inputs perturb network
dynamics, resulting in lasting effects that persist beyond the duration of the stimulus.
“However, the relationship between these dynamics and circuit architecture and their impact on sensory
processing, cognition and behaviour are poorly understood. By combining cellular-resolution calcium imag-
ing with mechanistic network modelling, we aimed to infer the spatial and temporal network interactions
in the zebrafish optic tectum that shape its ongoing activity and state-dependent responses to visual input.
“We showed that a simple recurrent network architecture, wherein tectal dynamics are dominated by
fast, short range, excitation countered by long-lasting, activity-dependent suppression, was sufficient to
explain multiple facets of population activity including intermittent bursting, trial-to-trial sensory response
variability and spatially-selective response adaptation. Moreover, these dynamics also predicted behavioural
trends such as selective habituation of visually evoked prey-catching responses. Overall, we demonstrate
that a mechanistic circuit model, built upon a uniform recurrent connectivity motif, can estimate the
incidental state of a dynamic neural network and account for experience-dependent effects on sensory
encoding and visually guided behaviour.”
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