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3. An organization wants to use the private network number 192.168.90.0 across four subnets. The maximum number of hosts that exist per subnet will be 25. What subnet mask would you use to solve the problem?

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Answer:

The correct answer is: 255.255.255.192.

Explanation:

A subnet mask complements an Internet Protocol (IP). Thanks to subnet masks IP addresses can be identified because they seem to be all the same but the subnet mask avoids confusion. If four subnets are to be created for the IP 192.168.90.0 3 bits of that IP must be used to create the subnet resulting in 255.255.255.192. Then:

  • Number of subnets: [tex]2^{3} - 2 = 6[/tex]
  • Number of hosts per subnet = [tex]2^{5} -2 = 30[/tex]

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