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| 1. |
_ What is the subnetwork number of a host with an IP address of 172.16.66.0/21?$? |
| A. | 172.16.36.0 |
| B. | 172.16.48.0 |
| C. | 172.16.64.0 |
| D. | 172.16.0.0 |
| Answer» D. 172.16.0.0 | |