Features:
 
Physical Port
28-Port 10/100/1000BASE-T Gigabit RJ45 copper with 24-Port IEEE 802.3at/af PoE Injector (Port-1 to Port-24)
4 100/1000BASE-X SFP slots, shared with port-25 to port-28 compatible with 100BASE-FX SFP
RJ45 console interface for switch basic management and setup
Reset button for system factory default and reboot
 
Switching
Hardware-based 10/100Mbps, half/full duplex and 1000Mbps full duplex mode, flow control and auto-negotiation, and auto MDI/MDI-X
Features Store-and-Forward mode with wire-speed filtering and forwarding rates
IEEE 802.3x flow control for full duplex operation and back pressure for half duplex operation
12K jumbo frame
Supports ESD protection
Contact Discharge 6KV DC
Air Gap Discharge 8KV DC
Automatic address learning and address aging
Supports CSMA/CD protocol
 
Power over Ethernet
Complies with IEEE 802.3at Power over Ethernet Plus, end-span PSE
Backward compatible with IEEE 802.3af Power over Ethernet
Up to 24 ports of IEEE 802.3af/802.3at devices powered
Supports PoE power up to 30 watts for each PoE port
PoE budget: GS-4210-24P4C: 370 watts / GS-4210-24PL4C: 650 watts
Auto detects powered device (PD)
Circuit protection prevents power interference between ports
Remote power feeding up to 100 meters in standard mode and 250m in extend mode
PoE management
Total PoE power budget control
Per port PoE function enable/disable
PoE Port Power feeding priority
Per PoE port power limitation
PoE delay 
PD classification detection
Intelligent PoE features
PD alive check
PoE schedule
PoE extension
 
Layer 2 Features
Prevents packet loss with back pressure (half-duplex) and IEEE 802.3x pause frame flow control (full-duplex)
High performance Store and Forward architecture, broadcast storm control, runt/CRC filtering eliminates erroneous packets to optimize the network bandwidth
Supports VLAN
IEEE 802.1Q tagged VLAN
Provider Bridging (VLAN Q-in-Q) support (IEEE 802.1ad)
Protocol VLAN
Voice VLAN
Private VLAN
Management VLAN
GVRP
Supports Spanning Tree Protocol
STP (Spanning Tree Protocol)
RSTP (Rapid Spanning Tree Protocol)
MSTP (Multiple Spanning Tree Protocol)
STP BPDU Guard, BPDU Filtering and BPDU Forwarding
Supports Link Aggregation
IEEE 802.3ad Link Aggregation Control Protocol (LACP)
Cisco ether-channel (Static Trunk)
Maximum 8 trunk groups, up to 8 ports per trunk group
Provides port mirror (many-to-1)
Loop protection to avoid broadcast loops
Supports ERPS (Ethernet Ring Protection Switching)
 
Quality of Service
Ingress/Egress Rate Limit per port bandwidth control
Storm Control support
Broadcast/Unknown-Unicast/Unknown-Multicast
Traffic classification
IEEE 802.1p CoS
TOS/DSCP/IP Precedence of IPv4/IPv6 packets
Strict priority and Weighted Round Robin (WRR) CoS policies
 
Multicast
Supports IPv4 IGMP snooping v2 and v3
Supports IPv6 MLD snooping v1, v2
IGMP querier mode support
IGMP snooping port filtering
MLD snooping port filtering
 
Security
Authentication
IEEE 802.1X Port-based network access authentication
Built-in RADIUS client to cooperate with the RADIUS servers
DHCP Option 82
RADIUS/TACACS+ login user access authentication
Access Control List
IPv4/IPv6 IP-based ACL
IPv4/IPv6 IP-based ACE
MAC-based ACL
MAC-based ACE
MAC Security
Static MAC
MAC Filtering
Port Security for Source MAC address entries filtering
DHCP Snooping to filter distrusted DHCP messages
Dynamic ARP Inspection discards ARP packets with invalid MAC address to IP address binding
IP Source Guard prevents IP spoofing attacks
DoS Attack Prevention
 
Management
IPv4 and IPv6 dual stack management
Switch Management Interface
Web switch management 
Console/Telnet Command Line Interface
SNMP v1 and v2c switch management
SSHv2, TLSv1.2/TLSv1.3 and SNMP v3 secure access
SNMP Management
Four RMON groups (history, statistics, alarms, and events) 
SNMP trap for interface Link Up and Link Down notification
User Privilege Levels Control
Built-in Trivial File Transfer Protocol (TFTP) client
BOOTP and DHCP for IP address assignment
System Maintenance
Firmware upload/download via HTTP/TFTP
Configuration upload / download through Web interface
Dual Images
Hardware reset button for system reboot or reset to factory default
SNTP Network Time Protocol
Network Diagnostic
ICMPv6/ICMPv4 Remote Ping
Cable Diagnostics
SFP-DDM (Digital Diagnostic Monitor)
Link Layer Discovery Protocol (LLDP) Protocol and LLDP-MED
Event message logging to remote Syslog server
SMTP remote alarm
PLANET Smart Discovery utility automatically finds PLANET devices on the network
PLANET NMS system and NMSViewerPro/CloudViewerPro/CloudNMS App for deployment management