Security is critical to data centers, especially multitenant data centers that host a variety of applications in a single facility. Conventional schemes place security devices (middleboxes) at a few choke points (e.g., core routers) and rely on routing policy to guarantee middlebox traversal. Coupling routing and security services together complicates operation and troubleshooting since routing and security are operated by different teams. When a data center scales, the security system needs upgrade accordingly. However, the current approaches are not flexible and incur high cost. Observing that rich computing resources are already available in data centers, we are interested in using a large number of software middleboxes to achieve scalability and cost efficiency. We present Hybrid Security Architecture (HSA), a design to decouple security services from routing and to allow the integration of hardware and software middleboxes in a complementary way. HSA is more cost-effective and flexible compared to the conventional schemes that solely use hardware middleboxes. It allows topology and routing changes with minimal impact to security services, and vice versa. In particular, HSA does not require modification to switches and routers. This paper explains the framework of HSA, describes the key techniques, presents a testbed to validate the design, and discusses future research directions.
With the popularity and development of application of network in colleges and universities, students enjoy the convenience of learning and school life network at the same time, it could also be that excessive and irregular use and create network obsession or addiction led directly to an increase in psychological problems among college students, lack of ideals and beliefs, moral quality of landslide, thus affecting the students ' healthy and smooth growth. How to educating and guiding college students, the prevention and resolution of network with negative consequences for physical and mental development of college students, into a new era, the new situation of ideological and political education of college students under the subject of intense interest.
This article taking into account the network efficiency, QoS, resource consumption, latency, performance and ease of use, and implementation of the system on the basis of factors such as the complexity, media management, node in the system management, and streaming media QoS control, buffer management, incentives, and other key algorithm and protocol analysis and design, and trying to achieve a balance between the factors. Finally developed real-time streaming data distribution system based on P2P MStreaming program, its resources quickly and easily launch and positioning, exert the advantage of P2P technology can effectively solve the problem of server bottleneck link, decentralized services and resource consumption.
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