A Linux amdinisrator is adding a user's local Linux account to the accounting group. The user is also a member of the finance group. Which of the following is the BEST way to add the user to the accounting group while still maintaining the user's existing group members ships?

A Linux engineer is troubleshooting a newly added SCSI device for a Linux server that needed more disk space without rebooting. The engineer discovers that the new device is not visible by the Linux kernel in fdisk -l output. Which of the following commands should be used to rescan the entire SCSI bus?

While mount: mount point /mnt/test does not exist
Which of the following commands best describes the action the Linux administrator should take NEXT?

A Linux administrator needs to remotely update the contents of the www.comptia.org/contacts URL.
Which of the following commands would allow the administrator to download the current contents of the URL before updating?

All users are reporting that they cannot connect to the SFTP server. The administrator runs a scan:

Which of the following would allow the administrator to fix the problem?