The Meraki content filtering on the access points is pretty rudimentary and relies on a list of sites maintained by Meraki to prevent access to adult content. However, they do also offer the option to use 'Custom DNS' which would allow you the capability to use a much more full-featured solution such as Cisco Umbrella (previously OpenDNS) to achieve more dynamic control. It's also worth noting that beyond the content filtering the access points also offer capability around firewalling, application based traffic shaping, and user based traffic shaping.
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