Question: In a subnet with a / 2 8 mask, why can't you rely solely on the first three octets to determine if an IP address

In a subnet with a /28 mask, why can't you rely solely on the first three octets to determine if an IP address is within the same subnet?
answer
Because the first three octets are always the same in any subnet
Because the subnet mask does not affect the first three octets
Because the /28 mask only applies to the last octet
Because the network prefix boundary lies within the last octet

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