Which of the following can be used as a security measure to protect a network?

Question

BlackTom AI · Accepted Answer

Username and password provide authentication and are a basic access-control mechanism, so they can be used to protect a network.

1) Relevant knowledge points and concepts
- Authentication: verifying a user’s identity (commonly via username + password).
- Authorization: granting access rights after authentication.
- Access control: mechanisms that limit who can connect to network resources.
- Difference between hardware (printer, modem), generic software, and security controls (credentials, firewalls, encryption).

2) Step-by-step reasoning
- The question asks which option is a security measure to protect a network.
- A security measure must actively restrict or control access or detect/prevent threats.
- “Username and password” restrict access by requiring valid credentials before granting network or resource access — this is directly a security control (authentication).
- “Printer” and “modem” are hardware devices used for printing and connecting to networks respectively; they are not security measures by themselves.
- “Application software” is a broad category; while some applications are security tools, the phrase alone does not specifically denote a security measure the way credentials do.

3) Calculations / intermediate steps
- No numerical calculations are required. The reasoning is conceptual and comparative.

4) Why the correct answer is correct
- Username and password implement authentication, a primary layer of defense. Requiring credentials prevents unauthorized users from logging into network accounts or resources, thereby protecting the network.

5) Why the other options are incorrect
- a. Printer: hardware peripheral; not a security control.
- b. Application software: too vague — not all application software provides security; the option does not specifically indicate a protection mechanism.
- d. Modem: a network interface device to connect to the internet; not a security measure (and can be a vector if unsecured).

6) Conclusion
- Therefore, the correct choice is “Username and password,” which matches the provided answer.

Which of the following can be used as a security measure to protect a network?单项选择题

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