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Which layer on the OSI model is an ARP Request?
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 and is sometimes referred to as a Layer 3 protocol. For the purposes of CCENT/CCNA, layer 2 is the correct answer.
MAC Addresses Media Access Control (MAC) addresses consist of a subset of data link layer addresses. MAC addresses identify network entities in LANs that implement the IEEE MAC addresses of the data link layer. As with most data-link addresses, MAC addresses are unique for each LAN interface.
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