NTC/362: Fundamentals of Networking
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NTC/362: Fundamentals of Networking
Q: How many bits are used for subnetting in a subnet, based on this sample address: 125.168.32.99 255.255.128.0?
A: 9 bits
Explanation: The address beginning with 125 is a Class A address and has a default mask of 255.0.0.0 (or 8 bits). In the example from the question, the mask implies a total of 17 combined network and subnet bits, which consists of 8 network and 9 subnet bits.
Using a mask with 10 subnet bits, along with a Class A network, means the mask is 255.255.192.0, which does not match the mask in the question.
Using a mask with 11 subnet bits, along with a Class A network, means the mask is 255.255.224.0, which does not match the mask in the question.
Using a mask with 12 subnet bits, along with a Class A network, means the mask is 255.255.240.0, which does not match the mask in the question.
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