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Juniper Networks, Inc. Registration Statement Declared Effective By SEC

SUNNYVALE, CA - November 21, 2003 - Juniper Networks, Inc. (NASDAQ: JNPR) today announced that on November 20, 2003 the Securities and Exchange Commission declared effective its Registration Statement on Form S-3 relating to the resale by selling security holders of its Zero Coupon Convertible Senior Notes due June 15, 2008 (the "Notes"), and the Common Stock issuable upon conversion of the Notes. The Company will not receive any proceeds from the resale of the Notes or the underlying Common Stock.

This news release shall not constitute an offer to sell or the solicitation of an offer to buy any securities of Juniper Networks, Inc., nor shall there be any sale of these securities in any state in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state. A final written prospectus meeting the requirements of Section 10 of the Securities Act of 1933 relating to these securities may be obtained from Juniper Networks, Inc., Attn: Investor Relations, 1194 N. Mathilda Avenue, Sunnyvale, CA 94089.

About Juniper Networks, Inc.

Juniper Networks transforms the business of networking by converting a commodity - bandwidth - into a dependable, secure and highly valuable corporate asset. Founded in 1996 to meet the stringent demands of service providers, Juniper Networks is now relied upon by the world's leading network operators, government agencies, research and education institutions, and information-intensive enterprises as the foundation for uncompromising networks. The Infranet Initiative uses Juniper Networks MINT (Model for InfraNet Transformation) as its underlying framework. Juniper Networks is headquartered in Sunnyvale, California. Additional information can be found at www.juniper.net.

Juniper Networks is registered in the U.S. Patent and Trademark Office and in other countries as a trademark of Juniper Networks, Inc. ERX, ESP, E-series, Internet Processor, J-Protect, JUNOS, JUNOScript, JUNOSe, M5, M7i, M10, M10i, M20, M40, M40e, M160, M-series, NMC-RX, SDX, T320, T640, and T-series are trademarks of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.