Microsoft NPS vs. Cisco ISE: Key Differences for Network Access Control
Microsoft NPS is a built-in Windows Server role that acts as a RADIUS server to authenticate users and devices on wired and wireless networks. Cisco ISE is a dedicated appliance or VM that does the same job plus deep profiling, policy orchestration, and threat mitigation across switches, routers, and firewalls.
IT teams often say “just use NPS” because it’s free with Windows licenses, but when CISOs demand device health checks or BYOD onboarding, the conversation suddenly shifts to “we need ISE.” The mix-up happens when budget meets compliance: free RADIUS feels enough until audits prove otherwise.
Key Differences
NPS gives basic 802.1X, PEAP, and EAP-TLS authentication; ISE adds TACACS+ for admins, pxGrid threat sharing, and 3rd-party MDM hooks. NPS scales to ~5 k auths/sec; ISE clusters push past 100 k. Licensing: NPS is covered by Windows CALs; ISE uses tiered DNA licenses per endpoint.
Which One Should You Choose?
Small to mid-size shops with only Windows endpoints and tight budgets stick with NPS. Enterprises needing visibility into IoT, guest, and contractor devices, plus rapid incident response, adopt ISE—even if it means new appliances and subscription costs.
Can NPS and ISE coexist?
Yes. Many firms keep NPS for legacy VPN while delegating switch-level control to ISE via proxy RADIUS.
Does ISE require Cisco switches?
No, but full features like TrustSec and SGT tagging only work on Cisco gear; third-party switches get basic 802.1X.
Is ISE’s cloud option cheaper?
Cisco ISE 3.x offers AWS/Azure SaaS, yet hardware appliances still dominate because data-residency clauses and latency-sensitive RADIUS remain on-prem.