Unparalleled FlexibilityEasily deployed and simple to manage the DGS-3420 can be virtually stacked with any switch that supports D-Links Single IP Management (SIM) to form a multi-level network structured with backbone and centralised high-speed servers. The virtual stack can include units located anywhere on the same network domain eliminating cable distance barriers limitations of physical stacking and the need for stack cabling.Redundant Ring StackingAlternatively depending on whether linear or fault-tolerant ring stacking 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 minimise network downtime in case a 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 cables** allowing high bandwidth and high port densities on the already cost efficient 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 help ensure that critical network services such as VoIP ERP Intranet and video conferencing are served with proper priority. The DGS-3420 Series provides D-Links Safeguard Engine to increase the switchs reliability serviceability and availability to prevent malicious flooding traffic caused by worms or virus infections. Bandwidth Control can be flexibly set for each port using pre-defined thresholds to assure 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 Tunnelling ICMPv6 DHCPv6 RIPng etc. With 10-Gigabit connectivity and IPv6 support the DGS-3420 Series enables you to 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 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 for the built-in fans to automatically turn on at a certain temperature providing continuous reliable and eco-friendly operation of the switch. The Time Based PoE feature allows to create a schedule when the PoE delivery can be disabled and save more energy.Features- 24 Gigabit PoE ports 4 SFP Combo ports and Four 10Gigabit SFP ports- Supports 802.3af (PoE) and 802.3at (PoE Plus) on all ports*- Physical stacking up to 12 units virtual up to 32- Web-based GUI for easy management- Comprehensive security features including Microsoft NAP- Comprehensive IPv6 support- Green technology Power-saving mode time-based PoE Smart Fans- Limited Lifetime Warranty- Advance Warranty Replacement (24 Hour Cross-shipment)D-Link DGS-3420-28PC. Switch type: Managed Switch layer: L2. Basic switching RJ-45 Ethernet ports quantity: 24 Console port: RJ-45. MAC address table: 16000 entries Switching capacity: 128 Gbit/s. Networking standards: IEEE 802.1DIEEE 802.1pIEEE 802.1QIEEE 802.1vIEEE 802.1wIEEE 802.3ahIEEE 802.3x. Power over Ethernet (PoE). Rack mounting