the year ended December 31, 2010, Verisign reported revenue of $681 million, up 10% from $616 million in 2009. Verisign operates two businesses, Naming Services, which encompasses the operation of top-level domains and critical Internet infrastructure, and Network Intelligence and Availability (NIA) Services, which encompasses DDoS mitigation, managed DNS and threat intelligence. On August 9, 2010, Symantec completed its approximately $1.28 billion acquisition of Verisign's authentication business, including the Secure Sockets Layer (SSL) Certificate Services, the Public Key Infrastructure (PKI) Services, the Verisign Trust Services, the Verisign Identity Protection (VIP) Authentication Service, and the majority stake in Verisign Japan. The deal capped a multi-year effort by Verisign to narrow its focus to its core infrastructure and security business units. Following ongoing controversies regarding Symantec's handling of certificate validation, which culminated in Google untrusting Symantec-issued certificates in its Chrome web browser, Symantec sold this unit to DigiCert in 2017 for $950 Million. In 2011, Verisign was selected by the General Services Administration (GSA) to operate the registry services for the top-level domain. They continued to operate service until 2023, when Cybersecurity and Infrastructure Security Agency (CISA) chose Cloudflare to replace Verisign as the .gov operator. Verisign's share price tumbled in early 2014, hastened by the U.S. government's announcement that it would "relinquish oversight of the Internet's domain-naming system to a non-government entity". Ultimately ICANN chose to continue VeriSign's role as the root zone maintainer and the two entered into a new contract in 2016. Naming services Verisign's core business is its naming services division. The division operates the authoritative domain name registries for two of the Internet's most important top-level domains, and . It is also the contracted registry operator for the .name and .gov top-level domains as well as the country code top-level domains (Cocos Islands) and (Tuvalu). In addition, Verisign is the primary technical subcontractor for the , and top-level domains for their respective registry operators, which are non-profit organizations; in this role Verisign maintains the zone files for these particular domains and hosts the domains from their domain servers. Registry operators are the "wholesalers" of Internet domain names, while domain name registrars act as the “retailers”, working directly with consumers to register a domain name address. Verisign also operates two of the Internet's thirteen "root servers" which are identified by the letters A-M (Verisign operates the “A” and “J” root servers). The root servers form the top of