Where in the PCI DSS compliance does it say I need to do regular internal scans of my network?

Where is the PCI DSS compliance does it say I need to do regular internal scans of my network?
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Dave BaldwinFixer of ProblemsCommented:
I don't know about that but my customer's merchant services vendor requires it every 3 months.
ie0Author Commented:
Dave, where do I find the vendor services requirements?
Dave BaldwinFixer of ProblemsCommented:
If you mean merchant services, it's normally part of your contract with them.  I have never had to do that because I am not the one taking the credit cards for payment.  My customer is.

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Christopher RourkeProduct Manager @ Experts ExchangeCommented:
11.2.1: Perform quarterly internal vulnerability scans. Address vulnerabilities and perform rescans to verify all “high risk” vulnerabilities are resolved in accordance with the entity’s vulnerability ranking (per Requirement 6.1). Scans must be performed by qualified personnel.

Here is the documentation from PCI Security Standards: https://www.pcisecuritystandards.org/documents/PCI_DSS_v3-2.pdf
Dave BaldwinFixer of ProblemsCommented:
Thanks Christopher.  Note also that the vendors for things like merchant services Also have to do the scans.  Everyone in the Payment Card chain must do them.
Christopher RourkeProduct Manager @ Experts ExchangeCommented:
Note also that the vendors for things like merchant services Also have to do the scans.  Everyone in the Payment Card chain must do them.

Quite true good sir. Much like a chain of custody, all links in the chain must be trusted.
btanExec ConsultantCommented:
Just to cover at large in requirement 11.2. Both external and internal scan are needed.
->(pdf with info on guidance of implementation)
11.2 Run internal and external network vulnerability scans at least quarterly and after any significant change in the network (such as new system component installations, changes in network topology, firewall rule modifications, product upgrades).

11.2.3 Perform internal and external scans, and rescans as needed, after any significant change. Scans must be performed by qualified personnel.
There are three types of vulnerability scanning required for PCI DSS:

 Internal quarterly vulnerability scanning by qualified personnel (use of a PCI SSC Approved Scanning Vendor (ASV) is not required)
 External quarterly vulnerability scanning, which must be performed by an ASV
 Internal and external scanning as needed after significant changes
Can take a look at the approved scanning vendor (ASV) on the different scan and penetration testing.

Just a note in the use of Third-Party Service Providers / Outsourcing, you should also have the managed hosting provider clearly define which of their IP addresses are scanned as part of their quarterly vulnerability scan process and which IP addresses are your (customer’s) responsibility to include in your (their own) quarterly scans
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