Skip navigation

Duo Security is now a part of Cisco

About Cisco


A record of entities, such as users, IP addresses, or countries, that are blocked or denied privileges or access. Implementing these precise controls over who can gain entry to a network increases the chances of keeping out remote attackers.

Want More Content Like This?

Subscribe to get a monthly email featuring blog posts, research, infographics, videos, e-books, security industry news, all handcrafted by Duo. You may unsubscribe any time.