The QNAP QSW-M5216-1T is a 16-port Desktop 25GbE Switch
Amazon.com: QNAP QXG-10G2TB Two Port 10GbE Network Card Supporting up to Five speeds (10GbE / 5GbE / 2.5GbE / 1GbE / 100MbE), and maximizes Your NAS and PC Network connectivity : Electronics
Our SwitchNAServer or QNAP QGD-1600P Review - ServeTheHome
Configuring Port Trunking with a QNAP Unmanaged Switch and a QNAP NAS | QNAP