Which one of the following is true regarding how a network operating system (NOS) provides security for a local area network (LAN)?

Question

BlackTom AI · Accepted Answer

A NOS manages user accounts and permissions for resources on the LAN, so it provides centralized authentication, authorization and access controls.

1) Relevant knowledge points and concepts
- Network Operating System (NOS): software that runs on servers to support networked resources (file/printer sharing, authentication, directory services). Examples: Windows Server with Active Directory, Linux with LDAP.  
- Security services provided by a NOS: authentication (verifying user identity), authorization (granting or denying access to files, printers and services), access control lists (ACLs), group policies, auditing and centralized administration.  
- Distinction between NOS functionality and local hardware/device connection: device drivers and standalone OS handle external storage and peripherals; modems connect to ISPs or gateways and are not inherently a NOS function.

2) Step-by-step reasoning
- Step 1: Identify what “provides security for a LAN” means: mechanisms to limit who can access networked resources and what they can do.  
- Step 2: Check which option describes those mechanisms. Option d explicitly mentions setting user permissions and restricting access to network resources — core NOS tasks.  
- Step 3: Verify other options concern hardware connectivity or peer-to-peer models, which do not require a NOS.

3) Calculations
- None required; this is conceptual reasoning.

4) Why the correct answer is correct
- A NOS centralizes account management and enforces permissions and restrictions across the LAN (e.g., user accounts, ACLs, group policies). These features are fundamental NOS responsibilities and directly relate to LAN security.

5) Why the other options are incorrect
- a) Connecting a modem to a peer-to-peer network is a physical/networking task and peer‑to‑peer setups often do not use a NOS.  
- b) Connecting external solid-state storage to a standalone device is handled by the device’s local OS and drivers, not a NOS.  
- c) Connecting external hard disk drives to a computer is likewise a local hardware/OS function, not a NOS requirement.

6) Conclusion
Therefore, the correct choice is d: a NOS is required to set user permissions and restrict access to network resources — matching the provided answer.

Which one of the following is true regarding how a network operating system (NOS) provides security for a local area network (LAN)?单项选择题

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