The ESA‑C690‑10G‑K9 Cisco IronPort C690 is a 2U rack‑mountable email security appliance designed for high‑throughput environments. It features six RJ‑45 ports that support 10/100/1000Base‑T connectivity and two 10GBase‑SX fiber ports for high‑speed uplink or inter‑device links. As part of Cisco’s IronPort series, the appliance delivers comprehensive threat protection, including anti‑spam, anti‑virus, and content inspection, while maintaining a compact footprint suitable for data‑center or enterprise deployments. Its dual 10GBase‑SX ports provide scalable uplink options, and the six RJ‑45 ports support standard Ethernet connections for management and auxiliary devices.