ADVANCED NETWORKING: A Practical Textbook on SDN, Fiber Optics, Wireless Systems, Network Security, and Server Maintenance  

Dr. Castro specializes in computer networking and information technology education, having taught major professional courses such as Network 1, Network 2, Network Management, Network Principles and Programming, and other computing-related subjects for many years. His professional competence is further reinforced by his TESDA National Certificate II (NC II) in Computer Systems Servicing, demonstrating proficiency in both theoretical instruction and industry-based technical practice. In addition to his undergraduate teaching responsibilities, he has extensive experience as a graduate school faculty member. He has taught in the Master in Management Engineering and Master of Education major in Computer Education programs at the School of Advanced Studies, Pangasinan State University, served in the Master in Development Management program of the Pangasinan State University Open University System, and currently teaches master's and doctoral courses in the Business Education Program at the Institute of Graduate and Professional Studies, Lyceum Northwestern University.

Beyond teaching, Dr. Castro is an accomplished researcher whose scholarly work spans computer networking, the Internet of Things (IoT), digital transformation, information systems, educational technology, business management, artificial intelligence, cybersecurity, and other emerging technologies. He has authored and co-authored numerous research articles published in reputable national and international peer-reviewed journals and has presented his research at various academic conferences, contributing to the advancement of interdisciplinary knowledge in computing, education, management, and technology. Among his notable achievements is the publication of research in an IEEE journal indexed in Scopus, demonstrating his commitment to producing internationally recognized, high-quality research that adheres to rigorous academic and scientific standards.

As an educator, graduate professor, researcher, curriculum developer, and author, Dr. Castro remains committed to advancing quality education through innovative, research-informed, and industry-responsive instructional resources. By integrating extensive teaching experience, technical expertise, and scholarly excellence, he develops learning materials that are academically rigorous, outcomes-based, and aligned with current technological and professional standards. His continuing dedication to excellence in teaching, research, and curriculum innovation reflects his vision of preparing competent, ethical, innovative, and globally competitive professionals capable of addressing the evolving demands of the computing and business professions.