Shaygan Kheradpir has been replaced by Rami Rahim.
Juniper Networks CEO Shaygan Kheradpir has resigned from his job, reportedly over negotiations with a customer.
During a review, the board of directors concluded Kheradpir to be unfit as to continue as chief executive of the company.
Shaygan Kheradpir has been replaced by Rami Rahim, who has been with Juniper Networks for 17 years and has served as the executive vice president and general manager of the company.
He has overseen research and development programmes strategy, development and evolution of silicon technology and the Junos operating system.
Juniper Networks CEO Rami Rahim said: "I am honored to be asked to lead Juniper — a company I have dedicated 17 years of my career to — at such an important time in our history.
"Juniper employees have truly risen to the challenge this year and that has enabled us to make incredible progress in 2014, including sharpening our focus on the highest-growth segments of the market, optimizing our organizational structure and improving cost management.
"The management team and I remain committed to our strategy and are excited about the opportunities that lie ahead for Juniper."