NAC & Cisco ISE Consulting

NAC and Cisco ISE Consulting — Coverage, Visibility, and Drift Control

By Digvijay Parmar · AI Security & Zero Trust Architect · Last updated 2026-07-07

Digvijay Parmar is a NAC and Cisco ISE consultant who built an enterprise NAC coverage assurance and endpoint visibility platform — connecting directly to Cisco switches to measure real 802.1X/MAB coverage, detect drift, and report remediation gaps across thousands of switchports.

The NAC coverage question every team should answer

Out of all the ports that should be NAC-protected, how many actually are — and where are the gaps? Most teams cannot answer this with confidence. NAC and Cisco ISE consulting should give you a defensible coverage number, not a guess.

I built a NAC Coverage Assurance and Endpoint Visibility Platform for Cisco ISE and switch environments that answers exactly that. It connects directly to Cisco switches, executes a controlled set of read-only commands, and analyzes interface-level configuration with intelligent eligibility logic.

How the platform works

If an organization has 22,000 eligible access ports and only 21,000 are NAC-covered, the platform highlights the remaining 1,000 as security gaps for review and remediation. Intelligent eligibility logic excludes ports that should not count toward NAC coverage — specific VLANs, access point ports, uplink ports, 25G/100G ports, infrastructure links, or any custom exclusion — so reporting reflects ports that genuinely require enforcement rather than inflated numbers.

Endpoint visibility correlates MAC address data with vendor/OUI information and switchport details to profile connected devices — endpoints, cameras, IoT, access points, printers — and flags devices sitting on unsecured ports. Recurring scheduled scans (every 24 hours or weekly) diff against the prior run to detect NAC drift, such as a port that was previously protected but is now deconfigured. Email integration sends post-scan summaries with coverage numbers, deltas, newly identified gaps, and interfaces requiring attention.

Cisco ISE experience

At Northern Trust I configured FirePOWER 9300 clustered mode and integrated Cisco ISE for automated remediation, and completed Cisco ACS to Cisco ISE 2.2 migrations using automated and manual processes. At Point72 I operationalized Zero Trust controls via deterministic validation of identity-aware ACLs, using Cisco ISE authorization logs as a core input.

I hold Cisco Security Core and CCNA/CCNP (Security / R&S) credentials. The combination of deep Cisco ISE configuration experience and the assurance platform on top is what makes this consulting different from a standard ISE deployment.

Book a free working session

Bring one real NAC problem — a coverage gap you cannot quantify, a drift issue, or an ISE migration you are scoping. You leave with a diagnosis and a written summary in 24 hours.

What collaborators say

"While working with Digvijay on the same network engineering team but different projects, he was very responsive and with detailed accurate information every time. No matter if it was requesting where to locate documentation, identify a specific config on a device or explain how an appliance is working the way it is, you could always depend on Digvijay to get things done in a timely detailed manner."

— Matthew Calhoun, Manager of US Security Operations, Northern Trust

"Digvijay is conceptually and practically very sound in Cisco Technology. He is great in network troubleshooting as well, with a continuous thirst for progress and a superlative personality."

— Mukesh Pathak, Senior Infrastructure Engineer (Network & Security), Maersk

Stack & tooling

Related work

Nac Coverage Investigation Platform

Frequently asked questions

What does a NAC and Cisco ISE consultant do?

A NAC consultant designs, deploys, and assures network access control — measuring 802.1X/MAB coverage, profiling endpoints, detecting drift, and validating identity-aware ACLs. Digvijay Parmar built a NAC Coverage Assurance Platform for Cisco ISE and switch environments.

How do you measure NAC coverage across thousands of switchports?

By connecting directly to Cisco switches, collecting read-only interface configuration, applying intelligent eligibility logic to exclude non-eligible ports, and computing eligible vs NAC-covered ports with scan-to-scan drift detection. The platform flags every uncovered gap and emails post-scan summaries.

Does Digvijay do Cisco ACS to ISE migrations?

Yes. At Northern Trust he completed Cisco ACS to Cisco ISE 2.2 migrations using automated and manual processes, and integrated Cisco ISE for automated remediation with FirePOWER 9300 clustered mode.

Can NAC consulting improve endpoint visibility?

Yes. MAC/OUI plus switchport correlation profiles connected device types — endpoints, cameras, IoT, access points, printers — and flags endpoints on unsecured ports, turning raw switch configuration into measurable endpoint visibility and remediation intelligence.

How is NAC consulting different from identity management consulting?

NAC is the access-layer enforcement platform (Cisco ISE, 802.1X/MAB, switchport controls). Identity management consulting is the broader practice of assuring identity-aware access across the estate. Digvijay covers both; see the AI identity management consulting page for the broader scope.

Bring one real problem. Leave with a direction.

The Agentic AI Standup is a free 40-minute working session. You bring one real nac & cisco ise consulting problem; you leave with a diagnosis, two or three concrete recommendations, and a written summary in your inbox within 24 hours. Three slots open each week.