Which of the following is the resident subnet ID for IP address 10.7.99.133/24?
- 10.0.0.0
- 10.7.0.0
- 10.7.99.0
- 10.7.99.128
Explanation: The mask converts to 255.255.255.0. To find the subnet ID, for each octet of the mask that is 255, you can copy the IP address’s corresponding values. For mask octets of decimal 0, you can record a 0 in that octet of the subnet ID. As such, copy the 10.7.99 and write a 0 for the fourth octet, for a subnet ID of 10.7.99.0.
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