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PSINet Selects Juniper Networks M40 Internet Backbone Router for Global Network

Mountain View, CA - January 12, 2000 - PSINet℠ Inc. (Nasdaq:PSIX), the Internet Super Carrier, has selected Juniper Networks, Inc. (Nasdaq:JNPR) next-generation IP infrastructure systems as part of the backbone technology for its worldwide network. Under the agreement, Juniper Networks will equip PSINet with M40 Internet backbone routers * to provide optical carrier speed of OC-48c Internet protocol (IP) routing for PSINet's frame-relay-based IP optimized network.

PSINet will deploy the M40 routing platform as a backbone and peering ** router, and will seamlessly evolve existing infrastructure to higher speeds and capacities capable of supporting the performance demands of Internet applications, including its expanding network of global Internet hosting centers.

"The Juniper Networks M40 router is ideal for PSINet's high performance network," said Ted Davis, senior vice president of PSINet and president of PSINetworks. "The M40 router will allow us to instantly upgrade our current network to meet current and future capacity demands."

"PSINet has extremely high service requirements in terms of peering flexibility and backbone reliability, under unpredictable network conditions," said Scott Kriens, Chairman and CEO of Juniper Networks. "PSINet is building a telecommunications infrastructure to cover nearly 80 percent of the world's economic base, and Juniper Networks technology gives them an immediate competitive advantage as they expand and diversify their network."

About PSINet

Headquartered in Herndon, VA, PSINet is an Internet Super Carrier offering global E-commerce infrastructure and a full suite of retail and wholesale Internet services through wholly-owned PSINet subsidiaries. Services are provided on PSINet-owned and operated fiber, satellite, Web hosting and switching facilities providing direct access in more than 800 metropolitan areas in 25 countries on five continents. PSINet information can be obtained by e-mail at info@psi.com, by accessing the Web site at www.PSINet.com or by calling in the U.S. 800-799-0676.

About Juniper Networks, Inc.

Juniper Networks, Inc. is a leading provider of purpose-built systems that meet the scalability, performance, density, and compatibility requirements of rapidly evolving, optically-enabled IP networks. The company's purpose-built systems provide new IP infrastructure solutions for the world's leading service providers. Juniper Networks service, manufacturing teams, and IP engineers work closely with customers to build and support customer networks. The company is headquartered in Mountain View, California. For more information, please contact the company at https://www.juniper.net.

Juniper Networks is a registered trademark of Juniper Networks, Inc. M40 is a trademark of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, or registered service marks may be the property of their respective owners.

* A device that forwards data packets from one local area network (LAN) or wide area network (WAN) to another.

** The act of one national Internet backbone provider accepting and passing traffic from another national provider.