Without cognitive networks, pervasive computing vision calls for every consumer a network technician. Applications of cognitive networks enable the vision pervasive computing, seamless mobility, ad-hoc networks, and dynamic spectrum allocation, among others. In detail, the author describes the main features of cognitive networks clearly show that the cognitive network design can be applied to all types of networks, a fixed or wireless. They explain why cognitive networks promise better protection against security attacks and network intruders and how it will benefit network operators and customer service. Presents hot topics such as biologically-inspired networking, autonomic networking, and adaptive network. Cognitive Networks is essential reading for advanced students, researchers, and practitioners interested in cognitive & wireless networks, pervasive computing, distributed learning, seamless mobility, and self-regulated network.