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Encapsulation/Decapsulation and ARP Our next lesson will discuss Encapsulation/Decapsulation and ARP or Address Resolution Protocol. As an FYI, feel free to visit http://subnettingquestions.com/ to gain more experience in subnet masking. We'll diagram and demonstrate what the layer 3 packet data unit looks like and examine it components such as the Frame Check Sequence and explain what its function is. We'll diagram and explain what Encapsulation is, how the Decapsulation process work, what the ARP process is and demonstrate how they are interrelated.