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What are the various technologies employed by wireless devices to maximize their use of the available radio frequencies? Also discuss methods used to secure 802.11 wireless networking in your initial thread. 

Read Course Textbook: Chapters 11 and 12

A. Satapathy and L. M. J. Livingston. (2016). “A Comprehensive Survey of Security Issues and Defense Framework for VoIP Cloud,” in Inidan Journal of Science and Technology, vol 9, no. 6.

D. B. Rawat, “Fusion of Software Defined Networking, Edge Computing, and Blockchain Technology for Wireless Network Virtualization,” in IEEE Communications Magazine, vol. 57, no. 10, pp. 50-55, October 2019.

T. Surasak and S. C. -. Huang, “Enhancing VoIP Security and Efficiency using VPN,” 2019 International Conference on Computing, Networking and Communications (ICNC), Honolulu, HI, USA, 2019, pp. 180-184.