Especificaciones:

Type Smart managed
Number of ports 28 ports
Layer Layer 2
Main type of ports 1000BASE-T Gigabit Ethernet
Type of uplink ports Combo 1000BASE-T/SFP / SF P
PoE options 802.3af / 802.3at
Number of PoE ports 24
D-Link Green: Sí
802.3az Energy-Efficient Ethernet support: Sí
Form Factor: Desktop / Rackmountable
Spanning Tree Protocol: 802.1D STP / 802.1s MSTP / 802.1w RSTP
Link aggregation 802.3ad
VLAN group (max static) 256
Advanced VLAN Asymmetric VLAN / Auto Surveillance VLAN  / Auto Voice VLAN
Number of QoS queues per port 8
CoS based on contents: Sí
Bandwidth control 16 Kbps minimum granularity
ACL type Ingress
ACL based on packet contents: Sí
Encryption protocol supported SSL (v1/v2/v3)
IP-MAC-port binding (IMPB) / Smart Binding: Sí
ARP spoofing: Sí
802.1X access control: Sí
SNMP (v1/v2c/v3): Sí
LLDP-MED: Sí
ICMPv6: Sí
IGMP Snooping: 
256 IGMP snooping groups (shared with MLD snooping)
IGMP Snooping Fast Leave
Max 1024 GMP Snooping Groups
Max 128 IGMP Snooping Groups
Max 256 IGMP Snooping Groups
Max 256 IGMP Snooping Groups
Max 64 IGMP Snooping Groups