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Juniper Networks Selected for Core and Metro Routing Deployments in BT's 21st Century Network

E-, M- and T-series Routing Platforms to Enable Fast, Assured and Dynamic Services Across One of the World's Most Advanced IP Networks

SUNNYVALE, Calif., May 16th, 2005 - Juniper Networks, Inc., (NASDAQ: JNPR) today announced that its edge and core routing platforms have been incorporated into solutions selected as part of BT's 21st Century Network (21CN) project. Lucent Technologies is set to integrate the Juniper Networks M- and T-series, including the TX Matrix platform, in the core backbone of the 21CN. In partnership with Siemens, Juniper Networks E-, M- and T-series routers are set to be deployed in the metro edge of the 21CN.

BT has announced it has selected Lucent Technologies and Siemens among its preferred primary suppliers for 21CN and expects to conclude contractual agreements with named preferred suppliers over the summer.

BT, the U.K.'s leading telecommunications provider, has designed the 21CN to revolutionize the national communications infrastructure for more than 20 million residential, business and wholesale customers. On a global scale, BT's 21CN is regarded as one of the most advanced and innovative deployments of an IP-based, converged data and telecommunications network to date. The solutions from Juniper Networks and its partners will provide BT with assured, high-performance network capacity to meet increased demand for diverse next-generation data, voice and video services.

"We're extremely proud that our routing platforms were selected by BT and look forward to working with our strategic partners to deliver secure and assured networks for enabling IP voice, video and data services," said Scott Kriens, chairman and CEO, Juniper Networks. "As members of the Infranet Initiative Council, BT, Siemens, Lucent, Juniper and many other companies all share a common Infranet vision that combines the reach of the Internet with the assured performance and security of a private network for a richer end user service experience."

Juniper Networks E-, M- and T-series routing platforms deliver industry-leading levels of performance, reliability and scale to enable service providers to deliver high-quality voice, video, data and other advanced services over an IP/MPLS network with assured levels of performance and security.

About Juniper Networks, Inc.

Juniper Networks is the leader in enabling secure and assured communications over a single IP network. The company's purpose-built, high performance IP platforms enable customers to support many different services and applications at scale. Service providers, enterprises, governments and research and education institutions worldwide rely on Juniper Networks to deliver products for building networks that are tailored to the specific needs of their users, services and applications. Juniper Networks' portfolio of proven networking and security solutions supports the complex scale, security and performance requirements of the world's most demanding networks. Additional information can be found at www.juniper.net.

Juniper Networks, the Juniper Networks logo, NetScreen, NetScreen Technologies, the NetScreen logo, NetScreen-Global Pro, ScreenOS, and GigaScreen are registered trademarks of Juniper Networks, Inc. in the United States and other countries.

The following are trademarks of Juniper Networks, Inc: T-Series, TX Matrix , JUNOS, M-series, E-series.