Most routers don't have many network ports because most gadgets use Wi-Fi. So if you've run out and need to add more, here's what you need to do.
The ST3300U3S USB 3.0 Gigabit Network Adapter turns a single SuperSpeed USB 3.0 host connection port into an RJ45 Gigabit network port as well as
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How to add more Ethernet ports to your Router - Using aa Network Switch
TL-SG3428XMP, JetStream 24-Port Gigabit and 4-Port 10GE SFP+ L2+ Managed Switch with 24-Port PoE+