Network+ Topic Practice: Ethernet, VLANs and Wi-Fi

Network+ Topic Practice: Ethernet, VLANs and Wi-Fi

Choose one best answer. Each attempt draws 10 of 20 questions; the practice pass mark is 8/10. LAN switching, VLANs, Wi-Fi and practical network diagnosis. Original topic practice, not an official exam or score prediction.
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Two PCs are in different VLANs. What is normally needed for them to communicate at IP level?