Cisco said today it had closed the $2.35 billion deal it made for network identity, authentication security company Duo.\nAccording to Cisco, Duo\u2019s zero-trust security model authorizes secure connections to all applications based on the trustworthiness of users and devices. Duo\u2019s cloud-delivered technology lets IT professionals set and enforce risk-based, adaptive access policies and get enhanced visibility into users\u2019 devices and activities. As more devices come onto the network remotely this issue takes on more importance.\n\u201cOutdated devices are particularly vulnerable to being compromised, which can easily spiral into a full-blown, major breach,\u201d wrote Richard Archdeacon, Duo Advisory CISO about a recent Duo study on remote access security. \u201cOrganizations don\u2019t necessarily need to block individuals from using their personal devices, but they do need to re-shape their security models to fit these evolving working practices. \u2026 If you don\u2019t know what\u2019s connecting to the network, how can you protect data from being compromised?"\n\nDuo in combination with products in Cisco\u2019s portfolio, including Umbrella, Stealthwatch, ISE, and Tetration, will let Cisco provide an end-to-end Zero Trust Architecture, wrote \u00a0Gee Rittenhouse, senior vice president of engineering for Cisco\u2019s Security Business Group, in a blog about the Duo acquisition.\u00a0\n\u201cIntegrating our network, device and cloud security platforms with Duo\u2019s zero trust authentication and access products, Cisco\u2019s security architecture is equipped to address the complex challenges that stem from hybrid and multi-cloud environments in today\u2019s work environment,\u201d Rittenhouse wrote.\nDetails of the Cisco\/Duo deal\nA few technical details of the deal include:\n\nCisco currently provides on-premises network access control via its Identity Services Engine (ISE) product. Duo's software as a service-based (SaaS) model will be integrated with Cisco ISE to extend ISE to provide cloud-delivered application access control.\nBy verifying user and device trust, Duo will add trusted identity awareness into Cisco's Secure Internet Gateway, Cloud Access Security Broker, Enterprise Mobility Management, and several other cloud-delivered products.\nWith Duo\u2019s Unified Endpoint Visibility, customers can see, track and report on all end user devices from a single dashboard. Duo's user and device reports give admins actionable data on user behavior and risky devices.\n\nCisco said integration of its network, device, and cloud security platforms with Duo Security\u2019s zero-trust authentication and access products will let customers quickly secure users to any application on any networked device.\nThe deal is Cisco\u2019s biggest since its $3.7 billion buy of performance monitoring software company AppDynamics in 2017, and its largest in the cybersecurity sector since its $2.7 billion Sourcefire acquisition in 2013. Duo, founded in 2010, has about 700 employees working from offices in Ann Arbor, Mich.; Detroit; Austin, Texas; San Mateo, Calif.; and London.\u00a0\nAccording to a report from MarketWatch, Duo said in early 2017 that it had recorded $73 million in annual recurring revenue in 2016, growing that total 135 percent from the year before. In a similar announcement in early 2018, Duo said it had surpassed $100 million in recurring revenue. Duo Security was valued at about $1.17 billion as of its last funding round.\nCisco Security topped $2 billion in annual revenue for the first time in the 2017 fiscal year, reporting $2.15 billion in sales out of Cisco\u2019s total of $48 billion.\nDuo CEO and co-founder Dug Song and the Duo team are joining Cisco\u2019s Networking and Security business led by executive vice president and general manager\u00a0David Goeckeler.