The Cisco ESA C680, identified by model number ESA-C690-K9, is a 2‑U rack‑mountable network security appliance that offers six 1000Base‑T Ethernet ports for high‑speed connectivity. Designed to provide robust firewall protection, it integrates seamlessly into enterprise or data‑center environments that require a compact, high‑performance security solution. The six Gigabit ports enable flexible network segmentation and traffic routing while the 2‑U footprint conserves rack space. Ideal for small to medium‑sized deployments, this appliance delivers essential firewall capabilities within a streamlined, rack‑ready package.