You have been asked by the networking team to assign a server a new static IPv4 address. When you try to apply the address 172.256.1.15 with a subnet mask of 255.0.0.0 the operating system immediately returns an error. Which condition is causing the error?
The DHCP server is not assigning an address, so the system has generated an APIPA address.
172.x.x.x is a Class B address but the subnet mask used is a Class A mask.
The IPv4 address is invalid.
There is not enough information provided to determine the problem.
An IPv4 address is composed of four decimal octets, each of which must be in the range 0-255. The second octet in 172.256.1.15 is 256, which exceeds the maximum value and makes the address syntactically invalid. The address is not in the APIPA range (169.254.x.x), and DHCP does not interfere when configuring a manual static address. Although 172.x.x.x is normally a Class B network (default mask 255.255.0.0), CIDR allows it to be used with any valid subnet mask such as 255.0.0.0, so the mask is not the problem.
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