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You are configuring some networking parameters on a Linux server which is going to be used as a mail server that handles messaging services for skillset.com. For security reasons you are asked to place the server in De-militarized Zone (DMZ). The given IP address is 221.194.213.X and Variable Length Subnetmask (VLSM) is /25. Using the given netmask, what is any valid IP address for the mail server?
255.255.255.128
221.194.213.129
221.194.213.0
221.194.213.255
221.194.213.127
221.194.213.128
This is wrong the subnet ranges we have are 221.194.213.0-221.194.213.127 and 221.194.213.128-221.194.213.255.
The first and the last IPs in these 2 ranges are reserved for the network and broadcast address and are NOT valid for the mail server. Only 221.194.213.129 falls in this range.
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