By Syed Asad Hussain
This forward-looking reference introduces a brand new iteration of community applied sciences and structure that permits the construction, customization, and administration of latest companies and functions deployed dynamically into community nodes. the writer outlines the structure of energetic and programmable networks, discusses the permitting applied sciences for community programmability intimately, and introduces a number of paradigms and prototypes. He then explores packet scheduling, administration, routing, and safety in lively and programmable networks and examines energetic instant and cellular networks. the ultimate bankruptcy offers a number of real-world examples of at the moment deployed lively and programmable networks.
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Additional info for Active and Programmable Networks for Adaptive Architectures and Services
19 Because the implementation details of layers are hidden from each other and the boundaries between layers are well defined, we can make changes in the layers without affecting other layers in the protocol stack. 25 to frame relay and from frame relay to ATM. ) of the protocol stack. 3 Drawbacks of the OSI Model It is considered that the Internet protocol or TCP/IP model has won over the OSI model in implementation and usage. Following are the main drawbacks of the OSI model: 1. The OSI standardization process was slow and complex.
The transport layer does not know what is going on at the network layer and how packets are transferred across the network. Suppose the packet loss is due to link errors rather than congestion on the network. In this situation, the transport layer wrongly throttles the source. If the network layer had informed the transport layer, the transport layer could have differentiated between the packet losses due to congestion and link errors. This situation could have avoided the unnecessary throttling of the source.
The committed access rate (CAR) controls the maximum rate for traffic transmitted or received on an interface. The CAR is often configured on interfaces at the edge of a network to limit traffic into or out of the network. Traffic that falls within the rate parameters is transmitted, while packets that exceed the acceptable amount of traffic are dropped or transmitted with a different priority. It also classifies the packets through IP precedence and QoS group setting. 11 The MPLS assigns short fixed-length labels to packets as they enter the network.
Active and Programmable Networks for Adaptive Architectures and Services by Syed Asad Hussain