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Traffic Engineering requires efficient tools to optimize network performance and traffic delivery. Most researches focus on routing optimization to find the shortest path length and balance load bandwidth in a network. In this paper we review the optimization approaches for Internet traffic engineering such as network routing optimization. We also review the intelligence approaches which are popular in this area such as Ants Colony Optimization (ACO), Practical Swarm Optimization (PSO), and other intelligence techniques. In addition, we summarize the applied techniques used for network optimization.
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