how can i say "초고속 인터넷" in english?
what does the native call that? "초고속 인터넷" "초고속 통신망" "광랜"

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"초고속 인터넷"  High-speed Internet, or, broadband internet

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Though direct translation is "High-speed Internet", I think it's mostly called "broadband internet, ..line, ..access, ..network, fiber-optic LAN, etc"

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High-speed Internet high-speed networks, "" FTTH "

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High speed Internet