CompTIA Linux+ Certification - (XK0-005) Exam Questions

Correct Answers:

`renice -n 19 -p 2345` and `renice 19 2345` are correct. The system administrator can use the `renice` command to lower or raise the priority of a job by providing a `nice` value from `-20` to `19` and the process ID.

Incorrect Answers:

`renice 19 fluidyn` is incorrect because the `renice` command takes the `nice` value and the process ID, not the process name.

`renice 2345 19` is incorrect because the process ID follows the `nice` value.

Correct Answer:

`ip addr show`is correct. Running `ip addr show` (or `ip addr` or just `ip a`) displays the network IP addresses of the Linux system. 

Incorrect Answers:

"`ip --show`," "`ip show addr`," and "`ip`" are incorrect. Running any of these commands would result in syntax errors.

Correct Answer:

The `dmidecode` command lists the Linux system’s BIOS while in multi-user mode. 

Incorrect Answers:

"`biosdump`," "`dmiencode`," and "`biosread`" are incorrect.  There are no Linux commands named `biosdump`, `dmiencode`, or `biosread`.

Correct Answer:

`nice -n -15 updatedb` is correct. In this case, the `nice` value is reduced to a negative number, which increases the process’s priority on the system.

Incorrect Answers:

"`nice -n 65 updatedb`," "`nice -n 80 updatedb`," and `"nice -n 0 updatedb`" are incorrect. Each of these answers sets the `nice` value to the same value as the default, or higher, which would reduce the process’s priority on the system (or at least leave it the same).

Correct Answer:

`lvcreate -L 500G -n HAF DUNK` is correct. A logical volume is defined after the volume group is defined, and is created from the volume group “pool” by executing `lvcreate -L 500G -n HAF DUNK`, for example.

Incorrect Answers:

`lvcreate -L 500G DUNK HAF` and `lvcreate -L 500G HAF DUNK` are incorrect because neither uses the `-n` variable to define the name of the new logical volume.

`lvcreate -L 500G -n DUNK HAF` is incorrect because `-n` defines the name of the new logical volume created, not the volume group it is being built from.

Correct Answers:

`select /dev/sda` and `print` are correct. Executing `select <device_path>` focuses any subsequent `parted` commands on that specific device (for example, `select /dev/sda`). The `print` command prints the partition table.

Incorrect Answers:

`select sda` is incorrect. `sda` is not a valid device name. `print /dev/sda` is incorrect. The `print` command does not use a device name, so specifying the device name, even though it’s correct, only displays help for the `parted` command; so, running `print /dev/sda` displays help for the `parted` command.

Correct Answer:

`dumpe2fs -h /dev/sda1 | grep state` is correct. A superblock lists filesystem metadata and is the roadmap into the entire filesystem. `dumpe2fs -h /dev/sda1 |grep state` reports the state of the filesystem.

Incorrect Answers:

`dumpe2fs -h` is incorrect. `dumpe2fs -h` requires a device name. `mkfs -nt ext4 /dev/sda1` is incorrect. `mkfs` creates a filesystem. `dumpe2fs -h /dev/sda | grep state` is incorrect. `dumpe2fs -h /dev/sda | grep state` wouldn’t work because it is a whole device rather than a partition such as `/dev/sda1`.

Correct Answer:

`iwlist` is correct. The `iwlist` command, with appropriate options, scans for wireless access points.

Incorrect Answers:

`ipconfig` is incorrect. `ipconfig` is a Windows command to list network interfaces. `iwconfig` is incorrect. The `iwconfig` command lists available wireless interfaces. `ifconfig` is incorrect. `ifconfig` is a Linux command to list network interfaces.

Correct Answer:

`reject printera ; lpmove printera* printerb` is correct. The question requires you to move the print jobs from `printera`’s queue to `printerb`’s queue and stop `printera` from accepting any other print jobs. To prevent any jobs from entering the queue, issue the `reject printera` command first and then move all jobs from `printera`’s queue to `printerb`’s queue by using the command `lpmove printera* printerb`.

Incorrect Answers:

`reject printera` is incorrect. The command `reject printera` would stop `printera`’s print queue from accepting print jobs.

`lpmove printera* printerb` is incorrect. The question required two steps: stop `printera`’s queue from accepting jobs and move the print jobs in `printera`’s queue to `printerb`’s queue. The command `lpmove printera* printerb` would move all print jobs from printera’s queue to printerb’s queue, but it would not stop `printera`’s queue from accepting jobs.

`accept printera` is incorrect. The command `accept printera` would allow `printera`’s print queue to accept print jobs.

Correct Answer:

`/etc/default/grub` is correct. `/etc/default/grub` contains a list of default variables used to configure GRUB2.

Incorrect Answers:

`/boot/grub2/grub.cfg` is incorrect. `/boot/grub2/grub.cfg` should not be edited; it is created when the menu-creation command `grub2-mkconfig` is executed. `/boot/grub2/menu.lst` is incorrect. There is no `/boot/grub2/menu.lst` file. `/boot/grub/menu.lst` is incorrect. `/boot/grub/menu.lst` is a GRUB legacy menu file.