As IT and OT environments continue to converge across the energy sector, traditional Network Access Control (NAC) solutions are struggling to address modern cybersecurity risks. This ebook explains why legacy, perimeter-based approaches create operational complexity, limited visibility, and increased exposure to lateral movement, particularly in critical infrastructure. It compares NAC with agentless microsegmentation, highlighting how identity-based, least-privilege access can isolate critical assets, reduce the attack surface, and prevent ransomware from spreading without requiring software agents on OT devices. The guide also explores deployment strategies, operational benefits, and how agentless microsegmentation helps energy organizations improve cyber resilience, simplify compliance,

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