D-Link DGS-3420-28SC 20 SFP 4 Combo 4 SFP+ network switch

20 SFP and 4 SFP+ ports

The D-Link DGS-3420-28SC is a managed Layer 2+ stackable switch built for high-density fibre aggregation. It provides 20 SFP ports, four combo RJ45/SFP ports and four SFP+ ports for 10 Gbps uplinks. The 16K MAC address table and 2 MB buffer support demanding traffic loads. Security features include SSH v2, storm control and ARP spoofing prevention.

Suits fibre-heavy access or aggregation layers

This switch fits networks that need many SFP connections and 10 Gbps uplinks without copper Gigabit density. It supports VLANs, QoS, SNMP and port mirroring for managed environments. Operators who require PoE power, a high count of RJ45 ports or Layer 3 routing should consider other models. The unit is managed, so unmanaged deployments will not use its feature set.

20 SFP ports decide fibre density

The defining specification is the 20 dedicated SFP ports combined with four SFP+ uplinks. This mix determines whether the switch matches a fibre-to-the-building aggregation point or a departmental access layer. Buyers must verify that their transceivers and cabling match the SFP and SFP+ interfaces before purchase.