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5.3.1. Device Hardening and NAC

Device Hardening:
  • Disable unused ports and services
  • Change default credentials
  • Apply patches and firmware updates
  • Remove unnecessary software
NAC (Network Access Control):
MethodFunction
Port securityLimit MACs per switch port
802.1XAuthenticate before granting access
MAC filteringAllow only specific MAC addresses
802.1X Components:
  • Supplicant: Client software requesting access
  • Authenticator: Switch/AP enforcing authentication
  • Authentication server: RADIUS server verifying credentials
Alvin Varughese
Written byAlvin Varughese
Founder•15 professional certifications