| Model | ISR4431-SEC/K9 |
| WAN Interface | 4 x Gigabit Ethernet SFP, 2 x Gigabit Ethernet RJ-45 |
| LAN Interface | 4 x Gigabit Ethernet RJ-45 ports |
| USB Interface | 2 x USB 2.0 ports |
| VPN | IPSec VPN, SSL VPN |
| Firewall | Stateful firewall, application-aware firewall |
| NAT | NAT/PAT |
| QoS | Classification, policing, shaping, queueing |
| Security | ACLs, MACsec, IPS, IDS, DDoS protection |
| Management | Web-based GUI, CLI, SNMP, RMON |
| Memory | 4 GB DRAM, 8 GB flash memory |
| Routing Protocols | BGP, OSPF, IS-IS, EIGRP, RIP, PIM, IPv4, IPv6 |
| PoE | No |
| Redundancy | Dual power supply available |
| Power Supply | 2 x AC or DC power supplies |
| Cooling | Front-to-back cooling with redundant fans |
| Latency | 3 microseconds |
| Switching Capacity | Up to 1 Gbps |
| Forwarding Rate | Up to 500 Kpps |
| Dimensions | 1.73 x 17.25 x 16 inches (H x W x D) |
| Weight | 22 lbs |
| Operating Temperature | 32°F to 104°F (0°C to 40°C) |
| Operating Humidity | 10% to 90% non-condensing |
| MTBF | 427,000 hours |
| Warranty | Limited lifetime hardware warranty |
| Certifications | UL 60950-1, CAN/CSA-C22.2 No. 60950-1, IEC 60950-1, EN 60950-1, AS/NZS 60950-1, GB4943-2011, FCC Part 15 Class A, VCCI Class A, EN 55032 Class A, EN 55024, CISPR 32 Class A, AS/NZS CISPR 32 Class A, EN 61000-3-2, EN 61000-3-3, EN 61000-4-2, EN 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6, EN 61000-4-8, EN 61000-4-11 |
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