American Tower Selects Mazu Networks' Intrusion Protection Solution to Protect Mission-Critical Business Applications.

Business Editors/High-Tech Writers

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Sept. 8, 2003

Leading infrastructure provider for the wireless and broadcasting industries uses Mazu Enforcer to protect online real estate management

system and key internal applications

Mazu Networks, a leading provider of enterprise network security solutions, today announced that American Tower Corporation (NYSE: AMT) has selected its Mazu Enforcer solution for network security. American Tower is using the Mazu Enforcer to protect both customer-facing systems and key internal applications and network resources.

American Tower is a leading independent owner, operator and developer of wireless communications towers. The company currently owns and operates approximately 15,000 communication sites in the United States, Mexico and Brazil. American Tower leases tower antenna space to its many wireless and broadcast customers and offers solutions such as site management, site development, construction and installation services.

Taking a phased approach, American Tower first implemented the Enforcer to protect the company's centrally managed, Internet-based real estate management system. The system is business-critical for the company because it serves as the main communication conduit through which marketing and sales staff share site information on their tower and antenna locations with customers and prospects. American Tower also uses the online real estate management system to monitor site status and to exchange important information with technical and operational staff members, 24 hours a day, 365 days a year.

Like most other corporations and enterprises that maintain mission-critical, externally-facing Web sites and online resources, American Tower had experienced a variety of cyber attacks against its real estate system. Distributed denial of service attacks were particularly troublesome, due to the difficulty experienced in stopping these types of attacks.

"The attacks on our public website were consuming large amounts of network resources as well as occupying several hours per week of our security engineers' time," said Eric Wassell, director of IT operations for American Tower. "We wanted an intelligent, proactive solution that would enable us to identify these attacks -- even the new, unknown ones -- and quickly take the right actions to mitigate them. We chose the Mazu Enforcer because it gives us the maximum level of protection against any unanticipated attack."

"Mazu is pleased and proud to win American Tower as a customer," said Jim Melvin, president and CEO of Mazu Networks. "They are a real leader in their market, and are definitely setting the pace for technological innovation. We look forward to helping them to continue to achieve their business objectives by maintaining the availability of their important online resources and business processes."

In the second phase of the implementation, American Tower deployed the Mazu Enforcer on the company's core network to protect against internal attacks. Company analysis showed that internal attacks began to occur after employees who brought their laptops home infected them by plugging them into their cable modems. Not realizing their machines were infected, they would then bring their laptops back onto the corporate network, causing the internal attacks. American Tower deployed an additional Enforcer in-line within the core network to ensure that these internal attacks were identified and thwarted before damage was done.

Mazu Enforcer - The Best in Behavioral Intrusion Protection

The Mazu Enforcer uses powerful, real-time statistical traffic analysis and traffic modeling to detect and characterize malicious activities occurring anywhere on a network. The Enforcer also provides highly accurate packet filtering technologies that enable network operations and security professionals to quickly contain and mitigate all attack types -- internal, external, known and unknown.

Based on the ability to analyze detailed network traffic data in real time, Mazu's Enforcer solution enables companies to implement behavioral intrusion protection around key business processes, whether external, internal or a combination of the two. The Enforcer complements Mazu's Profiler solution, a security platform that provides real-time detailed insight into how networks are used, and includes applications to both protect and plan the network more securely. The Enforcer also can leverage other security products, such as anti-virus programs, firewalls and intrusion detection systems. It enables organizations to maximize their overall security to ensure business continuity and employee productivity.

About American Tower

American Tower is the leading independent owner, operator and developer of broadcast and wireless communications sites in North America. Giving effect to pending transactions, American Tower operates approximately 15,000 sites in the United States, Mexico, and Brazil, including approximately 300 broadcast tower sites. Of the 15,000 sites, approximately 14,000 are owned or leased towers and approximately 1,000 are managed and lease/sublease sites. Based in Boston, American Tower has regional hub offices in Boston, Chicago, Phoenix, Mexico City and Sao Paulo. For more information about American Tower Corporation, please visit our web site www.americantower.com.

About Mazu Networks, Inc.

Mazu Networks is the first security company to provide real-time insight into enterprise network behavior, reducing the risk, cost and complexity of securing critical business applications. The company's real-time traffic modeling technology enables enterprises to profile, plan and protect networks with unmatched accuracy, efficiency and scalability. The Mazu Profiler protects internal and external access to critical applications. Mazu's Enforcer solution protects networks from traffic-based attacks. These solutions eliminate the tradeoff between security and accessibility, enabling organizations to broaden access to critical applications with less downtime and fewer resources. Mazu is backed by premier venture capital firms, including Greylock, Matrix Partners, Pilot House Ventures Group, and Benchmark Capital. Mazu is an IBM Business Partner. Headquartered in Cambridge, Mass., Mazu also has locations in New York, San Francisco, Washington, D.C. and London. For more information, please visit www.mazunetworks.com or contact the company at [e-mail].