Answer :
The subnet mask for a network with 256 IP addresses is C 255.255.255.128.
What is the subnet mask for a network with 256 IP addresses?
The IP address 10.1.240.240 belongs to network B) 10.1.0.0/16.
This is because the IP address falls within the range of addresses defined by the network address and subnet mask combination of 10.1.0.0/16, which specifies a range of IP addresses from 10.1.0.0 to 10.1.255.255.
The first two octets, 10.1, match between the IP address and the network address, indicating that they belong to the same network.
Network A) 10.2.1.0/16 does not include the IP address 10.1.240.240 and network C) does not exist as an option.
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