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KD Guo is a highly experienced Network Security Engineer with a Master's Degree in Computer Networks from Ryerson University. They have obtained multiple Cisco CCIE certifications and several cybersecurity certifications, including CISSP and CISA. KD has held senior positions at prominent companies such as Cigna Healthcare, KPMG, and BlackBerry, where they designed and implemented enterprise security solutions and network infrastructures. Currently, KD is a Senior Network Security Consultant at Cigna Healthcare, focusing on firewall upgrades and network support.