Virtual Private Networks: Sources

Rao, Umesh Hodeghatta, and Umesha Nayak. "Chapter 12: Virtual Private Networks." The InfoSec handbook: An introduction to information security. Springer Nature, 2014, pp. 245-262. URL: https://link.springer.com/content/pdf/10.1007/978-1-4302-6383-8.pdf#chapter+12:+virtual+private+networks