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| Brand Name : | Cisco |
| Model Number : | ISR4321/K9 |
| Certification : | CE |
Cisco ISR4321/K9 is a highly efficient and versatile ICT product that offers a system throughput of 50Mbps-100Mbps. It features 2 WAN/LAN ports, 1 SFP port, a multi-Core CPU, 2 NIM slots, and supports security, voice, WAAS, Intelligent WAN, OnePK, and AVC.

| Model | Differences |
| ISR4331-SEC/K9 | Higher system throughput |
| ISR4321-VSEC/K9 | Additional voice and security features |
| ISR4331/K9 | More WAN/LAN ports |
ISR4321/K9 Specifications | |
| System Throughput | 50Mbps-100Mbps |
| WAN/LAN Ports | 2 |
| SFP Port | 1 |
| CPU | Multi-Core |
| Management port | 1 GE (Integated Out of Band) |
| Security | Included |
| Voice | Included |
| PoE support (wattage) with PoE boost | 260 W |
| USB Ports (type A) | 1 |
| Default/max Flash | 4 GB / 8 GB |
| Performance | 50 Mbps Upgradeable to 100 Mbps |
| Power supply type | External: AC, PoE |
| Redundant power supply | No |
| Form factor | 1 rack unit (RU), desktop |
| Cisco Cloud Web Security | Yes |
| PoE support (wattage) without PoE boost | 120 W |

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