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Intent-based network (IBN) is a novel approach to network management and automation designed to simplify a generic high-level policy called intent to a specific low-level network configuration. At present, plenty of researches have focused more on definition of intent-based northbound interface (NBI) but less on methods for intent-based service orchestration. In this paper, an IBN reference architecture is presented to manage IoT infrastructure and deliver end-to-end services across multi-domains. After that, this paper introduces a DDQN-based heuristic algorithm to solve the dynamic service chain orchestration problem. Simulation results clearly show that the proposed algorithm has better cost efficiency and convergence than those of compared algorithms, and can also guarantee the QoS requirements and make the traffic balanced.

Software-defined network (SDN) is becoming an advance technology. It is not only used to manage IP networks but also manages data centers as well as cloud data and it can be applied in various types of networks. Earlier approaches for IP networks were more complex and IP networks are now a big network; thus, it is very difficult to manage those networks in terms of configuring thenetwork devices, applying policies on the network dynamically and get the knowledge of the faults, load and changes in the network. Software-defined approach made it easy to manage and configure the network. The role of the SDN controller in network devices can be extended with an application that effectively solves a particular problem and provide a flexible management service. One of the protocols used for this technology is OpenFlow. It basically works on southbound interface, i.e., between controller and network devices. Many solutions to utilize the network and exploit as much information possible from the network is one of the aim of researchers and many solutions have been proposed for the same. One of the most important and distinct features is to detect denial-of-service (DoS) attack quickly and precisely. In this paper, we are going to give an introduction about how and why SDN is trending and also analysis of solutions to detect and save a network from DDoS attacks.