[PCI DSS 1.x] 1.2.2 Secure and synchronize router configuration files.

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1.2.2 Secure and synchronize router configuration files.

1.2.2 Verify that router configuration files are secure and synchronized

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I am new to PCI DSS and this forum so please bear with me…

“Secure and synchronize router configuration files”

What does it mean ? and What do we need to do to acomplish this point ?