What does the following command accomplish? nc –v –z –w 1 10.10.23.4 1-1024
a. Starts a listener on the hacker's machine
b. Port scans the following IP address 10.10.23.4
c. Blocks traffic to the following IP address 10.10.23.4
d. Allows all traffic to the following IP address 10.10.23.4
ANS: B
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