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The Extreme Networks A4 is a highly reliable fast Ethernet edge switch that provides scalable, wire-rate performance in support of the bandwidth-intensive and delay-sensitive requirements of today's demanding applications. The A4 also provides multi-layer packet classification and priority queuing for differentiated services. The A4 includes enterprise-class features that ensure seamless connectivity and application performance. It's an excellent choice for medium to large enterprises that need to support thousands of endpoints. All A4s can now deploy separate policies for both a personal computer and a VoIP phone on a single switch port. In conjunction with its nonblocking L2 switching architecture, the A4's intelligent queuing mechanisms ensure that mission-critical applications receive prioritized access to network resources.