By Syed Asad Hussain
This forward-looking reference introduces a brand new new release of community applied sciences and structure that enables the production, customization, and administration of latest prone 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 energetic and programmable networks and examines lively instant and cellular networks. the ultimate bankruptcy offers a number of real-world examples of presently deployed energetic and programmable networks.
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Additional info for Active and Programmable Networks for Adaptive Architectures and Services
The main functions of the network layer are internetworking, addressing, routing, packetizing, and fragmentation. Internetworking is the logical attachment of different heterogeneous subnets together to give a feeling of a single network to the user applications. The devices on the Internet can communicate globally only if they are uniquely identified by an address. Two devices cannot have the same address. Because the devices are connected to the Internet, these addresses are called Internet addresses or IP addresses.
These services can sustain packet loss to some extent, but they are sensitive to delays. 10,12 It also provides synchronization functionality, that is, it allows applications to start from where they were after a crash. 12 It makes it possible for clients with dif ferent data types to communicate, that is, it hides the dif ferences between applications. The presentation layer also performs encryption, authentication, and data compression. Encryption and authentication are security features of networks.
The example is checksum computation. The movement of data in memory also adds overhead to the protocol processing. Data is moved in memory for two reasons. First, it is moved to separate the data from the header and get the data into the alignment needed by the application. Second, it is copied to get it from the I/O device to system address space and user address space. D. Clark et al. performed different tests to calculate TCP processing overhead. 24 The real systems, which consist of very different hardware and run very different operating systems, are expected to support the same services and protocols.
Active and Programmable Networks for Adaptive Architectures and Services by Syed Asad Hussain