The last few years have seen an explosion of interest in Zero Trust Network Access (ZTNA). The zero trust approach replaces the perimeter defense model with a "least privilege" framework where users authenticate to access specific data and applications, and their activities are continuously monitored.
ZTNA gained a boost in the wake of the COVID-19 pandemic, with more employees working remotely. The old perimeter defense model, exemplified by VPNs, provides a secured internet connection that gives remote users privileges as if they were on an internal private network. This doesn't match up with a zero trust mindset; and to make things worse, many organizations found that their infrastructure couldn't handle the traffic loads created by large numbers of remote workers connecting via VPN.
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