Acer Extensa Series (Generic User Guide) - Manual (Page 46)

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Built-in network feature
The built-in network feature allows you to connect your computer to an
Ethernet-based network.
To use the network feature, connect an Ethernet cable from the Ethernet
(RJ-45) port on the chassis of the computer to a network jack or hub on
your network.
Universal Serial Bus (USB)
The USB 2.0 port is a high-speed serial bus which allows you to connect USB
peripherals without taking up precious system resources.