Bengaluru, San Francisco: Cisco Systems Inc’s quarterly revenue in its closely-watched security business missed analysts’ estimates, raising concerns about the world’s largest networking gear maker’s efforts to transform into a software-focused company. The security business, which offers firewall protection and breach detection systems, has been Cisco’s fastest growing, until the last two quarter. Revenue growth at the business slowed to 3 per cent in the latest fiscal fourth quarter from 16 per cent a year earlier period and 9 per cent in the previous quarter. Chief Executive Chuck Robbins, the architect of Cisco’s transition, said he had “zero concerns” about the security business, while Kramer forecast an uptick in revenue in the upcoming quarter.