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Juniper Networks, Inc. Public Offering Declared Effective

Mountain View, CA - September 30, 1999 - Juniper Networks, Inc. (Nasdaq:JNPR), a leading provider of next-generation Internet infrastructure systems, today announced that its public offering was declared effective by the Securities and Exchange Commission for the sale of 5,000,000 shares, excluding the over-allotment option granted to the underwriters, of Juniper Networks common stock. Of the shares being offered, the Company will offer 1,500,000 shares and certain stockholders of the Company will offer 3,500,000. The Company expects the shares will be delivered to the underwriters on October 5, 1999. The offering was managed by Goldman, Sachs & Co., Credit Suisse First Boston, BancBoston Robertson Stephens, Dain Rauscher Wessels, a division of Dain Rauscher Incorporated, SG Cowen Securities Corporation and Warburg Dillon Read LLC.

A copy of the Prospectus relating to the offering may be obtained from the Prospectus Department of Goldman, Sachs & Co., at 85 Broad Street, New York, NY 10004, 212-902-1000. You can also view the registration statement on the Internet at http://www.freeedgar.com.

About Juniper Networks, Inc.

Juniper Networks is a leading provider of next-generation Internet infrastructure systems that are designed to meet the scalability, performance, density, and compatibility requirements of rapidly evolving, optically-enabled IP networks. The company's purpose-built M40 Internet backbone router uses JUNOS software, ASICs, and line-rate performance to provide new Internet infrastructure solutions for service providers. The M40 router is used by some of the world's leading service providers.

Juniper Networks service, manufacturing teams, and Internet engineers support the M40 router. The company is headquartered in Sunnyvale, California*, with international offices in Leatherhead, UK, and Tokyo, Japan. For more information on Juniper Networks, please contact the company at 408-745-2000 or visit the Web site at https://www.juniper.net.

Juniper Networks is a trademark of Juniper Networks, Inc. All other trademarks are property of their respective companies.

Actual results could differ materially from those anticipated in forward-looking statements in this release as a result of certain factors, including those set forth in the risk factors described in the Company's SEC filings.