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CCNP Security SISAS 300-208 Official Cert Guide by Kevin Redmon, Aaron Woland

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Verify Whether the Certificate Has Been Revoked

Pretend for a moment that you are driving down the road and are pulled over by a police officer. The officer asks for your driver’s license and proof of insurance. You hand him a driver’s license, which is immediately checked for evidence of authenticity—that is, does it look like a valid driver’s license or a forgery? Okay, it’s not a forgery. Check. Next, expiration? It is not expired. Check. Now the officer asks you to wait while he goes back to his squad car.

While in the squad car, the officer performs some authorization checks (are you a registered owner of the car you were driving, and so on). Those are not important for this hypothetical scenario, though. What is important is that the officer ...

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