What is boundary level masking, Computer Networking

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Q. What is Boundary Level Masking?

If mask numbers are either 255 or 0:
- Bytes in the IP address that correspond to 255 in the mask will be repeated in the subnet mask
- Bytes in the address that correspond to 0 in the mask will change to 0 in the subnet address
IP address 45 23 21 8
Mask 255 255 0 0
Subnet 45 23 0 0

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