Wednesday January 24, 2000

Press Release

Metromedia Fiber Network Offers 100% Service Level Agreement Guarantee On Internet Network Availability

MFN-Owned Fiber-Optic Network Allows Unmatched Scaleability and Access

NEW YORK--(BUSINESS WIRE)--Jan. 24, 2001-- Metromedia Fiber Network, Inc., (MFN) (Nasdaq: MFNX) the leader in deployment of optical IP Internet infrastructure within key metropolitan areas domestically and internationally, and provider of world-class data centers and Internet connectivity through its AboveNet Communications subsidiary, now offers a service level agreement (SLA) guaranteeing 100% IP network availability to all customers co-located in an AboveNet Internet Service Exchange (ISX) facility.

``No other network provider offers a better service level agreement than this one,'' said Paul Vixie, chief technology officer of Metromedia Fiber Network. ``Our guarantee ensures 100% IP network availability and facility power to address the needs of our customers for reliable performance.''

MFN's extensive fiber-optic network, combined with AboveNet's state-of-the-art co-location facilities, enables the company to provide superior network performance to back up the 100% SLA guarantee. The layered and regionalized network allows for isolation and seamless redundancy in case of network problems, as well as phasing of software and hardware upgrades to ensure continuous up-time. The ISX facilities provide the most advanced, fail-safe data center environment available, as well as superior Internet connectivity. And, MFN's unmatched number of peering relationships and high-quality connections also support the delivery of information directly to the destination network, ensuring improved performance.

For customers, the SLA agreements will provide an additional sense of security and peace of mind when moving mission-critical applications to the Internet. While the service remains as efficient and effective as always, customers now have MFN's commitment in writing.

About Metromedia Fiber Network, Inc.

Metromedia Fiber Network, Inc., the leading provider of end-to-end optical 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. For more information about Metromedia Fiber Network, please visit the company's Web site at

Together with its subsidiaries, AboveNet Communications, Inc., a leading provider of Internet connectivity and co-location solutions for high-bandwidth and business-critical applications, and, 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 scaleable optical networks and IP services to Internet content and service providers, carriers and enterprise users worldwide.

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. 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's service offering call 800/475-2733 or visit the company's Web site at

AboveNet, Internet Service Exchange, ISX, and AboveNet 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 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 are described from time to time in the SEC reports filed by Metromedia Fiber Network including the most recently filed Forms S-3, 10-K and 10-Q.

     Metromedia Fiber Network
     Kara Carbone
     Gibbs & Soell Inc.
     Gary Gatyas