Can you please tell me the difference between authenticated scan and perimeter scan ?
Thanks in advance,
I am not exactly sure I am following your question, but I will take a stab at it.
Scanning from the outside using the Qualys External scanners gives clients the "outside" view of their devices. Meaning what can any untrusted party see from any location outside your network. These scans should not use credtentials as you are trying to measure your security posture, by evaluating your firewall rules and host configurations.
Scanning with authentication is done from the inside the firewall. This is clients the most complete view of their systems and helps with a variety of security functions, patch audit, security intelligence, risk awareness, etc.
Please let me know if I did not answer your question.
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