Peter H. Gregory Books

CISSP guide to security essentials
CISSP guide to security essentials

By Peter H. Gregory

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CISSP GUIDE TO SECURITY ESSENTIALS provides readers with the tools and resources they need to develop a thorough understanding of the entire CISSP Certification Body of Knowledge. Using a variety o...

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Data backup for dummies
Data backup for dummies

By Peter H. Gregory

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What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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