the dgs-3420 series of next generation layer 2+ gigabit switches deliver performance, flexibility, security, multi-layer qos and access control, along with redundant power solutions for smbs and businesses. with high gigabit port densities, gigabit sfp and 10-gigabit sfp + support, and advanced software solutions, these switches can act as either departmental access layer devices or aggregation switches to form a multilevel network structured with backbone and centralized high-speed servers. service providers can take advantage of high sfp density switches to structure the aggregation of fiber to building (fttb) networks that they extend to the subscriber sites.unparalleled flexibilityeasily deployed and simple to manage, the dgs-3420 can be virtually stacked with any switch that supports d-link single ip management (sim) to form a multi-level network structured with backbone and centralized high-speed servers. the virtual stack can include units located anywhere on the same network domain, eliminating cable spacing barriers, limitations of physical stacking, and need for stack cabling.redundant ring stackingalternatively, depending on whether a line stack is implemented, users can use one or two 10-gigabit sfp + ports to create a physical stack1. switches in the stack are hot-swappable to minimize network downtime in casea replacement is required, eliminating single points of failure. up to 12 units or 576 gigabit ports can be configured for a stack using direct attached cables1 allowing high bandwidth and high port densities on the already cost effective dgs-3420 series.security, performance availabilitythe dgs-3420 series provides a complete set of security features including l2/l3/l4 multi-layer access control lists and 802.1x user authentication via tacacs + and radius servers.the dgs-3420 series offers extensive vlan support including gvrp and 802.1q vlan to enhance security and performance. a robust set of l2/l3/l4 qos/cos solutions helps ensure that critical network services such as voip, erp, intranet, and video conferencing are served with proper priority. the dgs-3420 series provides d-link safeguard engine to increase the reliability, serviceability, and availability of the switch to prevent malicious flood traffic caused by worms or virus infections. bandwidth control can be flexibly set for each port using pre-defined thresholds to ensure a committed level of service for end users. for advanced applications, flow-based bandwidth control allows easy fine tuning of service types based on specific ip addresses or protocols.ipv6 technologythe dgs-3420 series also features comprehensive ipv6 support including ipv6 tunneling, icmpv6, dhcpv6, ripng, etc. with the 10-gigabit connectivity and ipv6 support, the dgs-3420 series enables you to make future-proof your network for cost-efficiency and longevity while meeting the requirements for ipv6 capable network devices in the coming years.d-link green technologyd-link is striving to take the lead in developing an innovative and power-saving technology that does not sacrifice operational performance or functionality. the dgs-3420 series implements the d-link green technology, which includes a power saving mode, smart fan, reduced heat dissipation, and cable length detection. the power saving feature automatically powers down ports that have no active link. the smart fan feature allows the built-in fans to automatically turn on at a certain temperature, providing continuous, reliable and eco-friendly operation of the switch.