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Cable & Wireless Deploys Breakthrough Security Technology from Juniper Networks into Network Backbone

Allows Cable & Wireless to Block Denial of Service Attacks without Compromising High Speed Network Performance

Vienna, VA - April 18, 2000 - Cable & Wireless (NYSE: CWP), the global telecommunications group, today announced it is deploying Juniper Networks, Inc.'s (Nasdaq:JNPR) new Internet Processor II ASIC, which will enable Cable & Wireless to filter undesirable IP traffic and block denial of service attacks without affecting the high-speed performance of its global IP network. Cable & Wireless is one of the first Internet backbone providers to deploy Juniper Networks Internet Processor II ASIC, the most advanced IP processing chip to date, to enhance security functions and increase analysis of network operations.

"Juniper's advanced security weapon represents a quantum leap in preventive network security," said Robert Flood, chief technology officer at Cable & Wireless. "Typically, this type of filtering has not been available because of the performance degradation it presents to networks. By deploying Juniper's security technology, Cable & Wireless is one of the first companies to now have the capability to filter IP traffic on an immense scale with no impact to the performance of our network. That is extremely beneficial to our network and customers."

With the deployment of the Juniper Networks Internet Processor II ASIC, Cable & Wireless will be able to filter IP traffic anywhere at any circuit speed and block denial of service attacks and potentially any unauthorized traffic that crosses the core of Cable & Wireless' network. In addition, the logging and sampling capabilities of Internet Processor II will allow better visibility into network trends and traffic patterns. With these security enhancements, Cable & Wireless will be able to respond to security issues faster and more effectively, as well as assisting peers when they might experience security issues.

"The Cable & Wireless network is now experiencing a 100-fold improvement in packet filtering, giving them the ability to prevent unwanted traffic from affecting their network and their customers," said Pradeep Sindhu, chief technology officer at Juniper Networks. "We are pleased that Cable & Wireless recognizes the power of the Internet Processor II ASIC and has chosen to be one of our first customers to deploy this technology."

Last month Cable & Wireless set an Internet milestone by activating the world's first wire-rate clear channel OC-192c 10Gbps IP/MPLS circuit using Juniper Networks M160 routers. Juniper Networks Internet Processor II ASIC is being deployed with the M160 router platform across Cable & Wireless' global IP network. Cable & Wireless will retrofit all other currently deployed Juniper routers with the new Internet Processor II ASIC.

Cable & Wireless also announced today the acquisition of a majority holding in IPERGY, a Brussels based company providing a pan European fiber optic Internet backbone supporting a range of IP and co-location services. This acquisition will bring forward Cable & Wireless' roll out of IP services in Europe by nine months.

About Cable & Wireless

With customers in 70 countries, Cable & Wireless is a major global telecommunications business with revenue of around $13 billion in the year ended March 1999 and more than 50,000 employees. Its businesses around the world offer a range of services spanning broadband data and Internet access, fixed and mobile voice, as well as interactive entertainment and information. Cable & Wireless' priority for expansion is the fast growing market of data and IP (Internet Protocol) services for business customers. Since November 1998, it has announced major investments in advanced networks in the US and Europe, the restructuring of Cable & Wireless Communications in the UK and has acquired full control of Cable & Wireless IDC in Japan to support this strategy. Cable & Wireless now holds a unique position in terms of global coverage and services to business customers.

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, 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 the Web site at https://www.juniper.net.

Juniper Networks is a registered trademark of Juniper Networks, Inc. Internet Processor II, JUNOS, M20, M40 and M160 are trademarks of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks or registered service marks may be the property of their respective owners.