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| Brand Name : | Cisco | 
| Model Number : | ISR4321/K9 | 
| Certification : | CE | 
Cisco 4321 Integrated Services router is design to deliver advanced services to the small enterprise branch environment. It delivers 50Mbps thoughtput by default. With pay-as-you-grow performance, you can increase forwarding capacity to 100Mbps by buying FL-4320-PERF-K9 licenses.


| Technical Specifications | ISR4461/K9 | ISR4451-X/K9 | ISR4431/K9 | ISR4351/K9 | ISR4331/K9 | ISR4321/K9 | ISR4221/K9 | 
| Aggregate Throughput | 1.5Gbps | 1 Gbps to 2 Gbps  | 500 Mbps to 1 Gbps  | 200 Mbps to 400 Mbps  | 100 Mbps to 300 Mbps  | 50 Mbps to 100 Mbps  | 35 Mbps to 75 Mbps | 
| Total onboard WAN or LAN 10/100/1000 ports | 4 | 4 | 4 | 3 | 3 | 2 | 2 | 
| RJ-45-based ports | 4 | 4 | 4 | 3 | 2 | 2 | 2 | 
| SFP-based ports | 4 | 4 | 4 | 3 | 2 | 1 | 1 | 
| Enhanced service-module slots | 3 | 2 | 0 | 2 | 1 | 0 | 0 | 
| Doublewide service-module slots | 2 | 1 (assumes no singlewide SM-X modules installed) | 0 | 1 (assumes no singlewide SM-X modules installed) | 0 | 0 | 0 | 
| NIM slots | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 
| OIR (all I/O modules) | Yes | Yes | Yes | Yes | Yes | Yes | No | 
| Onboard ISC slot | 1 | 1 | 1 | 1 | 1 | 1 | No | 
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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