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NEW QUESTION 53
A Linux administrator needs to remove a USB drive from a system. The unmount command fails, stating the device is busy. Which of the following commands will show the reason for this error?

A. ps aux | grep /mnt/usbB. mount | grep /mnt/usbC. lsof | grep /mnt/usbD. lsusb | grep /mnt/usb

Answer: C

 

NEW QUESTION 54
Find the file named core and remove it from the system.
INSTRUCTIONS
Type "help" to display a list of available commands.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

Answer:

Explanation:
See explanation below.
Explanation
Solution as

 

NEW QUESTION 55
An administrator is troubleshooting to determine why backups are failing on a particular server. The administrator runs the ps command and analyzes the following output.

The administrator runs kill -9 10112 yet the process remains.
Which of the following BEST describes the issue and how to fix it?

A. The backup process is using 100% of system resources and needs to be rescheduled with renice.B. The backup process is a zombie process, and the system needs to be rebooted.C. The backup process is out of memory, and more memory needs to be added to the system.D. The backup process is still running and needs to be killed with kill -9 --force 10112.

Answer: B

 

NEW QUESTION 56
A new HTTPS web service is being deployed on a server. Which of the following commands should the Linux administrator use to ensure traffic is able to flow through the system firewall to the new service?

A. iptables -I INPUT --dport 443 -j ACCEPTB. iptables -I OUTPUT -p tcp --sport 443 -j ACCEPTC. iptables -A OUTPUT -p tcp --dport 443 -j ACCEPTD. iptables -A INPUT -p tcp --dport 443 -j ACCEPT

Answer: A

Explanation:
Explanation/Reference: https://www.linode.com/docs/security/firewalls/control-network-traffic-with-iptables/

 

NEW QUESTION 57
A junior systems administrator needs to schedule a backup script named /scripts/backup.sh and make the correct changes to the crontab.
Which of the following crontab entries would run the script every Monday at 2:05 a.m.?

A. 1 * * 5 2 /scripts/backup.shB. 2 5 * * 1 /scripts/backup.shC. 5 2 * * 1 /scripts/backup.shD. 1 * * 2 5 /scripts/backup.shE. 5 2 * * 0 /scripts/backup.sh

Answer: C

Explanation:
Minute (0 - 59) 0= every minute
Hour (0 - 23) 0= every hour
Day of month (1 - 31)
Month (1 - 12)
Day of week (0 - 7) (Sunday=0 or 7)
Reference:
https://tecadmin.net/crontab-in-linux-with-20-examples-of-cron-schedule/

 

NEW QUESTION 58
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