The answer to your question would depend on the specific setup of the course you are referring to. However, in most cases, interaction with an online course typically occurs through a WLAN (Wireless Local Area Network) if you're connecting via Wi-Fi. If you're using a wider network, it might involve a WAN (Wide Area Network). A VPN (Virtual Private Network) can also be used for secure access.
If you're looking for the most common answer for online course interactions, the answer would likely be:
WLAN.
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