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Metromedia Fiber Network Planning to Deploy Global Optical Network Using Juniper Networks M160 Routers

MFN's Worldwide Optical IP Network to Benefit from Increased Speeds and Security Measures

New York, NY - July 31, 2000 - Metromedia Fiber Network, Inc., (MFN) (Nasdaq: MFNX) and Juniper Networks, Inc. (Nasdaq: JNPR), have announced the purchase and deployment of 170 Juniper Networks M160 Internet backbone routers by MFN. MFN is the leader in deployment of optical IP Internet infrastructure within key global metropolitan areas internationally, and provider of world-class data centers and Internet connectivity through its AboveNet Communications subsidiary. Juniper Networks is a leading provider of IP infrastructure equipment.

MFN is presently deploying the M160 routers throughout its worldwide optical IP network, including all Internet Service Exchange (ISX) facilities, as part of a global OC-192c (10 gigabits/second) backbone network deployment.

"Our new M160 routers with the Internet Processor II ASIC represent the latest in core network routing technology by delivering performance without compromise and enabling services at speeds never seen before," said Scott Kriens, chairman and CEO of Juniper Networks. "This deployment plan clearly reflects MFN's commitment to its customers to utilize the most advanced technology to deliver the most reliable and best Internet experience possible."

In addition to increased bandwidth capacity and processing power, MFN's deployment of M160 routers represents advancements in the areas of network security and network traffic shaping. The Internet II processor ASIC is capable of filtering 10 Gigabit links at wire speed, enabling increased security measures against various forms of denial of service (DOS) attacks. MFN is also leveraging the sampling and logging capabilities of the M160 router with the superior connectivity of the AboveNet global one-hop network to optimize traffic.

"We are always looking for breakthrough infrastructure technology to ensure that our IP network is the most robust, secure, and reliable in the world," said Nick Tanzi, president and COO of Metromedia Fiber Network. "Our purchase of the M160 routers represents a valuable addition to our suite of defenses against attacks on our network. Furthermore, this leading-edge technology helps us complete our planned network expansion faster and more reliably."

Metromedia Fiber Network's planned deployment of an all-optical IP architecture over a dedicated fiber optic network that reaches throughout the local loop in 67 cities in North America and Europe will seamlessly connect all AboveNet facilities. This expansive network will provide customers with exceptionally fast and reliable connectivity to the Internet. The improved capacity and reach of the network, with up to multi-terabit-per-second capacity, combined with world-class co-location facilities, provides an ideal IP infrastructure for Internet-centric companies.

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 and manufacturing teams and IP engineers work closely with customers to build and support customer networks. The company is headquartered in Sunnyvale, California. For more information, please contact the company at 408 745-2000 or visit our Web site at https://www.juniper.net.

Juniper Networks is a registered trademark of Juniper Networks, Inc. Internet Processor II and M160 are trademarks of Juniper Networks. All other trademarks, service marks, registered trademarks, or registered service marks may be the property of their respective owners.

About Metromedia Fiber Network, Inc.

Metromedia Fiber Network, Inc., the leading provider of optical IP Internet infrastructure network solutions, is revolutionizing the fiber optic industry. By offering virtually unlimited, unmetered bandwidth at a fixed cost, Metromedia Fiber Network is eliminating the bandwidth barrier and redefining the way broadband capacity is sold. Metromedia Fiber Network is extending metropolitan fiber optic infrastructure to the end user in strategic top-tier markets, enabling its customers to implement the latest data, video, Internet and multimedia applications. In addition to its current expansion in 51 cities in North America, Metromedia Fiber Network is establishing an international presence with planned fiber optic network builds in 16 cities throughout Europe.. Together with its subsidiaries, AboveNet Communications, Inc., a leading provider of co-location and Internet connectivity solutions, and Paix.net, Inc., the leading neutral Internet Exchange, Metromedia Fiber Network is unleashing the full potential of the Internet. The combined company facilitates the explosive growth of e-commerce and advanced Internet applications by delivering secure, reliable and scalable optical networks and IP services to Internet content and service providers, carriers and enterprise users worldwide.

AboveNet Communications, Inc., a subsidiary of Metromedia Fiber Network, Inc., is a leading provider of Internet connectivity and co-location solutions for high bandwidth and business-critical applications. Headquartered in San Jose, Calif., AboveNet is the architect of the Internet Service Exchange (ISX)-a world class network that provides co-location services and Internet connectivity for content providers, ISPs and application service providers. The AboveNet Global One-Hop Network is designed to deliver fast, scalable and reliable connections to the Internet and improves the Internet experience for end-users. With its Tier 1 status and ISO 9002 certification, AboveNet is seeking to serve the global community of the Internet. For more information on AboveNet and its service offering call 800/475-2733 or visit the company's Web site at www.above.net.

AboveNet, Internet Service Exchange, ISX, and AboveNet Global One-Hop Network are trademarks of AboveNet Communications, Inc. All other company or brand names may be trademarks of the respective companies with which they are associated.

This news release contains certain forward-looking statements that involve risks and uncertainties. Factors that could cause or contribute to such risks and uncertainties include, but are not limited to, general economic and business conditions, competition, changes in technology and methods of marketing, and various other factors beyond the Company's control. This also includes such factors as described from time to time in the SEC filings by Metromedia Fiber Network, including the most recently filed Forms S-3, 10-K and 10-Q.