ACSP Startup and System Issues 5

Question 1

A Mac consistently shows a spinning globe instead of the Apple logo at startup. What does this indicate?

Accepted Answer

The Mac is attempting to boot from a NetBoot or network startup source because no valid local startup disk was found

Answer

A spinning globe at startup means the Mac did not find a valid local startup disk and is searching for a bootable network source via NetBoot.

Question 2

Which log file should a technician examine first to identify the cause of a recent kernel panic on macOS?

Accepted Answer

/Library/Logs/DiagnosticReports/ for .panic files

Answer

macOS writes a detailed .panic file to /Library/Logs/DiagnosticReports/ after each kernel panic, which contains the backtrace and loaded kexts at the time of the crash.

Question 3

A technician enables verbose mode on a Mac and notices the startup process halts after 'waiting for DSMOS.' What does this message indicate?

Accepted Answer

The system is waiting for the Don't Steal Mac OS (FairPlay) kernel service to authorize the boot volume

Answer

DSMOS (Don't Steal Mac OS) is a macOS FairPlay kernel service that must complete authorization before user-space processes can start; a hang here often indicates a corrupted or tampered system.

Question 4

After a user enables FileVault, the Mac requires a password at pre-boot that is different from the login password. What has most likely occurred?

Accepted Answer

A separate institutional recovery key or different enabled user was set as the pre-boot account

Answer

Only users who have been granted Secure Token and are enabled for FileVault pre-boot can unlock the drive; if a different account is set, that account's credentials are required at startup.

Question 5

Which command-line tool can a technician use in Terminal (booted from Recovery or a regular session) to verify and repair a startup volume's filesystem?

Accepted Answer

fsck_apfs

Answer

fsck_apfs is the low-level filesystem consistency check tool for APFS volumes and can detect and repair errors that Disk Utility's First Aid also invokes internally.

ACSP - Apple Certified Support Professional Practice Test

ACSP - Apple Certified Support Professional Practice Test

ACSP Startup and System Issues 5