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Address Resolution Protocol (ARP) Tables exist on which layer of the OSI model?
Network
Physical
Data Link
Transport
ARP is layer 2. The reason being is that a broadcast is sent on layer 2 (data link layer) and ARP will normally not traverse to layer 3 (network layer). However it can provide extra features to the layer 3 protocol.
The truth is that not all protocols fit the OSI model exactly, because after all it's just a model. If you really want to push it into a spot I'd say ARP is a layer 2.5 protocol. It fits layer 2, but doesn't fit layer 3 completely.
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