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Fast Ethernet, operating at 100 Mbps, is a new LAN technology designed to meet high demands for network bandwidth. Network managers/organizations also benefit from Fast Ethernet by leveraging the familiarity of the underlying Ethernet technology and the protection offered for investments in applications, cabling, and management expertise.

Criteria for Improving Network Performance
Network designs must consider both media contention and requirements for raw bandwidth. While switched-10-Mbps Ethernet resolves media contention issues, many high-performance desktop applications require the bandwidth of Fast Ethernet to transmit their data. For example, in an electronic prepress application, a single page document can yield more than eight Megabytes (8 MB) of data.

When evaluating solutions based on 100-Mbps Fast Ethernet, network managers/organizations should consider three primary factors: performance, management, and migration.

Performance
Network managers/organizations can address the performance demands of many users by alleviating media contention in existing, shared-10-Mbps Ethernet networks. Switching can micro-segment users and provide uninterrupted access to 10-Mbps Ethernet. However, high performance PCs and workstations or new network architectures may not be satisfied by even dedicated-10-Mbps architectures. These applications require high bandwidth to move their large amounts of data across the network in a timely manner.

Management
To manage high bandwidth, mission critical applications in the workgroup or building backbone, administrators need comprehensive traffic monitoring tools. Remote Monitor (RMON) based network monitors can help administrators track the flow of data throughout the network and detect potential problems before they affect critical applications. RMON tools are also useful for capacity planning and network accounting functions.

While monitoring tools help to identify potential scaling and security issues, network administrators also require traffic management tools that can segregate traffic and manage communication between workgroups. Routing allows administrators to control access to sensitive information by users in different workgroups. Routing also delivers the broadcast firewall mechanisms that ensure continued stability in growing, complex, high-speed networks.

Migration Cost and Effort
Network managers/organizations want technologies that are inexpensive to acquire, and equally important, inexpensive to maintain. They want technologies that use existing data-grade structured wiring and support existing applications without modification. Managers know technology that meets these requirements will ensure economical migration to higher-bandwidth networks by minimizing disruptions and hidden costs such as network downtime and lost productivity. In addition, if the new networking technology is based on existing LANs, managers can leverage their technical experience for a shorter learning curve and management ease.

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