# ISE vs Forescout vs ClearPass: same job, different first move

Source: https://ai.techclick.in/blog_cisco_ise_vs_forescout_clearpass
Markdown: https://ai.techclick.in/blog_cisco_ise_vs_forescout_clearpass.md
Publisher: Techclick Infosec Pvt Ltd

Same NAC job, different language: RADIUS-first ISE vs visibility-first Forescout vs ClearPass. Interview table.

## The ticket

 You trained ISE. The shop bought Forescout for OT. They still need 802.1X for laptops. Both can live together via eyeExtend / pxGrid — if you know who owns which decision.

  Quick interview answer

 ISE is RADIUS-first: 802.1X, MAB, CWA, dACL. Forescout is visibility-first: discover and classify without a supplicant, then enforce (virtual firewall, switch plugin, or hand off to ISE). ClearPass is Aruba’s RADIUS NAC cousin. Many campuses: Forescout sees everything; ISE authenticates users.

  Hero · three boxes

 OT cameras rarely speak PEAP. Laptops should not rely on MAB forever.
  Lab data · dummy only
 PAN  ise-pan   10.10.10.20  · PSN  ise-psn1   10.10.10.21  · MnT  ise-mnt   10.10.10.22  · NAD  sw-access-01   10.10.10.2  · AD  dc01   10.20.30.10  · Priya  10.20.30.80   TECHCLICK\priya.hr  · printer  10.20.30.60 . Not a live customer.

## Translation table

   Idea  ISE  Forescout  ClearPass

  Brain  PAN / PSN  Enterprise Manager / Appliance  Publisher / Subscriber
  User auth  802.1X PEAP/EAP-TLS  Often via ISE/NPS plugin  802.1X
  Agentless device  MAB + profiling  eyeSight discovery  Profiling
  Enforce  dACL / VLAN / CoA  Virtual FW / switch plugin / ISE  Enforcement profiles
  Logs  Live Logs  Policy / host log  Access tracker

## When each bites

   Need  Lead with

  User identity on campus ports  ISE 802.1X
  OT / IoT / medical with no supplicant  Forescout visibility, careful enforce
  Aruba wireless estate  ClearPass is native; ISE still works
  Both users and OT  Forescout + ISE together

## Interview answer

- #### Their word “eyeSight is your discover. On ISE I would call that profiling + Context Visibility.”

- #### One proof ISE: Live Logs. Forescout: host profile + policy hit.

- #### One failure Unknown permit-all, or 802.1X on a PLC.

## Four mix-ups

### 1 · Calling Enterprise Manager “the PSN”

### 2 · 802.1X on OT because “NAC requires it”

### 3 · Two systems enforcing opposite VLANs

### 4 · Brand rant

## Say it out loud

  30-second version

 ISE authenticates users with RADIUS and downloads dACLs. Forescout finds devices that cannot authenticate and can orchestrate ISE or the switch. I would not run two conflicting enforcement owners on the same port.

## Traps

   They say  You say

  Agentless NAC  Forescout visibility or ISE MAB+profile
  Policy set  Forescout policy tree / ClearPass service
  CoA  Same idea: bounce the session after classify

## Knowledge check

   Judgment items. One best answer. Reasons send you back to the matching section.

       Q1
       ISE’s first superpower vs Forescout?

           RADIUS 802.1X user auth
           Better OT passive only
           No logs
           No NAD needed

       Correct:  a . Quick answer.

       Q2
       Forescout’s first superpower vs ISE?

           Agentless discovery/classification
           It replaces AD
           It is a firewall only
           It cannot enforce

       Correct:  a . Concept.

       Q3
       OT PLC with no supplicant. Worst first move?

           Force 802.1X PEAP
           Passive discover then careful control
           Quarantine VLAN if you must enforce
           Inventory the MAC

       Correct:  a . Mix-up 2.

       Q4
       Two NACs on one port. Risk?

           Opposite VLAN/ACL decisions
           Faster PEAP
           Better NTP
           Automatic PAN HA

       Correct:  a . Mix-up 3.

       Q5
       ClearPass is closest to…

           ISE (RADIUS NAC)
           Gaia OS
           Hide NAT
           ClusterXL

       Correct:  a . Table.

       Q6
       Best interview move?

           Translate once, then use their words
           Say Forescout is fake NAC
           Refuse OT shops
           Only quote list prices

       Correct:  a . Runbook.

       Check answers
       Reset

  Cisco ISE class series:   Personas  ·  First day  ·  NAD + RADIUS  ·  Policy sets  ·  Wired 802.1X  ·  MAB  ·  CWA / guest  ·  Profiling  ·  dACL vs VLAN  ·  Live logs  ·  vs Forescout  ·  Interview

## Sources

- This ISE series + Forescout series.
- Forescout product pages: eyeSight / eyeControl / eyeExtend.
- ISE 3.3 personas and policy sets.

 Related:  ISE evidence desk  ·  session factory  ·  Forescout series .

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