If you can see this check that
The /proc/net/arp cache stores:
A. | Particular ARP is in charge of a particular IP on a particular interface.
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B. | MAC address is particular IP.
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C. | MAC address on a particular interface is particular IP.
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D. | Particular IP has announced it is in charge of particular MAC
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E. | Particular network is via particular MAC.
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4-sa-16

This is more reverse ARP management. The ARP cache is usually considered to be the opposite of this statement.
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1-sa-16

No, MAC address is mapped to a particular IP on a particular network.
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0-sa-16

This is correct, and having both pieces of information helps to protect against MAC spoofing.
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3-sa-16

This is more reverse ARP management. The ARP cache is usually considered to be the opposite of this statement.
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2-sa-16

MAC caching must at least associate MAC to IP.
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