Final answer:
Intrusive penetration-style testing involves actively trying to break into the network to uncover security weaknesses. It is aggressive and thorough, as opposed to non-intrusive testing, which is more passive.
Step-by-step explanation:
The type of penetration-style testing that involves actually trying to break into the network is D. Intrusive. Intrusive testing means the tester actively enters into a system or network to uncover security weaknesses, such as vulnerable points of entry or data leakage. This type of testing can include attempts to exploit any vulnerabilities found, and is generally more aggressive and thorough than non-intrusive testing.
Using secondary data is considered an unobtrusive or nonreactive method, according to the reference provided. This means the research does not interfere with the subjects or alter their behavior, ensuring that the data remains unaffected by the research process. Such a method can be contrasted with intrusive penetration testing where the tester actively engages with the systems in question.
The type of penetration-style testing that involves actually trying to break into the network is intrusive testing, option D. In this type of testing, the penetration tester attempts to exploit vulnerabilities in the network's security measures in order to gain unauthorized access. This can involve activities such as scanning for open ports, attempting to guess passwords, or launching attacks to exploit known vulnerabilities.