Why does the BSD kernel prevent the securelevel from being lowered at runtime?

To prevent accidental changes by non-root users.

To ensure the system always runs at the highest possible security level.

To allow the system administrator to change the securelevel only after a full backup.

To prevent an attacker who has gained root access from disabling security restrictions.

Which statement accurately describes how kernel MIBs are organized in a BSD system?

They are organized as a hierarchical tree of dot-separated names, grouping related parameters under top-level categories.

They are stored as a flat list of numeric identifiers that must be looked up in a manual page.

They are stored in a single binary database that is only accessible by the kernel itself.

They are defined exclusively in the /etc/sysctl.conf file and cannot be viewed at runtime.

Which command temporarily changes the kernel MIB net.inet.ip.forwarding to 1 (enabling IP forwarding) on a BSD system?

sysctl -w net.inet.ip.forwarding=1

sysctl net.inet.ip.forwarding=1

sysctl -a net.inet.ip.forwarding 1

echo 1 > /proc/sys/net/inet/ip/forwarding

A FreeBSD administrator needs to temporarily increase the maximum number of open files per process to 65536 to support a database migration. The change must survive until the next reboot, but the administrator does not want to edit any configuration files. Which command accomplishes this?

sysctl kern.maxfilesperproc=65536

echo 'kern.maxfilesperproc=65536' >> /etc/sysctl.conf

sysctl -w kern.maxfilesperproc=65536

sysctl -a kern.maxfilesperproc=65536

What is the only way to lower the securelevel on a BSD system once it has been raised?

Kill the init process and restart it.

Use sysctl -w kern.securelevel=0 as root.

Recompile the kernel with a lower securelevel.

LPI BSD Specialist

Domain 1Objective 5

711.5 BSD Kernel Parameters and System Security Level (weight: 2) BSD-SPECIALIST Practice Questions (Page 1)

Part of the Topic 711: BSD Installation and Software Management domain, which makes up ~21% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 90-minute exam (~35–60 total, ~7–13 in this domain), expect 1–3 from this objective — we provide 23 practice questions to prepare you well beyond it. (estimate)

23questions here

5free pages

8concepts

Questions 1–5

1foundation · easy
Why does the BSD kernel prevent the securelevel from being lowered at runtime?
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2foundation · easy
Which statement accurately describes how kernel MIBs are organized in a BSD system?
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3foundation · easy
Which command temporarily changes the kernel MIB net.inet.ip.forwarding to 1 (enabling IP forwarding) on a BSD system?
Select an answer first
4application · medium
A FreeBSD administrator needs to temporarily increase the maximum number of open files per process to 65536 to support a database migration. The change must survive until the next reboot, but the administrator does not want to edit any configuration files. Which command accomplishes this?
Select an answer first
5foundation · easy
What is the only way to lower the securelevel on a BSD system once it has been raised?
Select an answer first

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