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What is DNS? A computer engineer explains this foundational piece of the web – and why it’s the internet’s Achilles’ heel

  • Written by Doug Jacobson, University Professor of Electrical and Computer Engineering, Iowa State University
What is DNS? A computer engineer explains this foundational piece of the web – and why it’s the internet’s Achilles’ heelAmazon Web Services, hosted in data centers like this one in Virginia, supports thousands of websites, apps and online services – but not during its recent DNS outage.Nathan Howard/Getty Images

When millions of people suddenly couldn’t load familiar websites and apps during the Amazon Web Services, or AWS, outage on Oct. 20, 2025, the...

Read more: What is DNS? A computer engineer explains this foundational piece of the web – and why it’s the...

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