1. จงอธิบายเกี่ยวกับ ฮับ (HUB)
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2. จงอธิบายเกี่ยวกับ สวิตซ์ (Switch)
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3. จงอธิบายเกี่ยวกับ มัลติเพล็กซ์เซอร์ (Multiplexer)
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