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Help please Question 21 (5 points) Which OSI layer does each of the following devices operate at? 1. Layer 1 2. Layer 2 3. Layer

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Question 21 (5 points) Which OSI layer does each of the following devices operate at? 1. Layer 1 2. Layer 2 3. Layer 3 4. Layer 4 5. Layer 5 6. Layer 6 7. Layer 7 Hub Stateful Firewal Switch Router Application Proxy Question 22 (5 points) What is the difference between a proxy and a frewall? DELL

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