Latest 702-100 Pass Guaranteed Exam Dumps Certification Sample Questions [Q25-Q46]

Explanation
The sysctl command is used to set and get kernel state variables, including the FreeBSD security level. The security level is a variable named kern.securelevel, which can have values from -1 to 3, with higher values indicating more restrictions. The security level can only be increased, not decreased, unless the system is rebooted or in single-user mode. The security level affects various operations, such as loading kernel modules, changing immutable flags on files, and modifying device nodes12 References: 1:
https://docs.freebsd.org/en/books/handbook/security/#security-basics-securelevels 2:
https://www.freebsd.org/cgi/man.cgi?query=sysctl&sektion=8

Explanation
The file command is used to determine the type of data contained in a computer file. It performs a series of tests on the file and prints a description of the file type based on the first successful test. The file command can take one or more file names as its arguments. For example, file mybackup will display the file type of mybackup. The other options are not valid commands for finding the file type. References:
file command in Linux with examples
file (command) – Wikipedia
Linux File Command

Explanation
The pgrep command is used to find processes by various criteria, such as user name, group name, process ID, command name, etc. The -u option specifies the user name or user ID to match. Therefore, the command pgrep
-u bob will show all processes owned by the user bob. The output will be a list of process IDs, one per line. To show more information about the processes, such as command name, arguments, state, etc., the -l, -a, and -f options can be used. For example, the command pgrep -l -u bob will show the process ID and the command name for each process owned by bob. References:
pgrep – FreeBSD, the manual page for the pgrep command on FreeBSD.
How to use pgrep and pkill commands in Linux – Linuxize, a tutorial on how to use the pgrep and pkill commands in Linux.

Explanation
The find command is used to search for files and directories that match certain criteria. The – -type option specifies the type of file to look for, and the d argument means directories. The . argument means the current directory. Therefore, the command find – -type d searches for all directories within the current directory. The other options are either invalid or do not match the question. References: 1:
https://www.comptia.org/training/books/a-core-1-220-1101-study-guide, page 301 2:
https://www.howtogeek.com/771399/how-to-use-the-find-command-in-linux/, section “The Linux find Command”

Explanation
The command that generates the output showing kernel module IDs, reference counts, addresses, sizes, and names iskldstatin FreeBSD. This command is used to display thestatus of loaded kernel modules, including those loaded dynamically. The output format shown in the question is characteristic ofkldstat, where it lists the kernel modules currently loaded into the system’s memory along with their respective details.
References:
FreeBSD Handbook or Manual Pages (man pages), specifically the section on kernel modules and the kldstatcommand.
Linux Professional Institute BSD Specialist resources, which cover FreeBSD commands and utilities, including those for managing kernel modules.

Explanation
The command df -h displays the disk space usage of all mounted filesystems in a human-readable format. It shows the size, used, available, and percentage of each filesystem, as well as the mount point. This command can be used to check the local filesystems that are currently mounted.
https://unix.stackexchange.com/questions/24182/how-to-get-the-complete-and-exact-list-of-mounted-filesystems
https://www.tecmint.com/find-mounted-file-systems-in-linux/
https://itslinuxfoss.com/check-filesystem-mounted-linux/

Explanation
A symbolic link, or symlink, is a special type of file that points to another file or directory on the file system1.
When creating a symbolic link with the ln command, the syntax is as follows:
ln -s target link
where target is the file or directory to link to, and link is the name of the symbolic link2. If the link name already exists, the ln command will fail and display an error message indicating that the target already exists3. This is because the ln command does not overwrite existing files or directories by default4. Therefore, the only way to create a symbolic link with the same name as an existing file or directory is to manually remove the existing target first, and then run the ln command again. Alternatively, the ln command can be used with the -f (force) option, which will remove the existing target and create the symbolic link in one step4.
However, this option is not mentioned in the question, so the correct answer is A.
References: 1: How to Create Symbolic Links in Linux [Complete Guide] – Linux Handbook 2: Ln Command in Linux (Create Symbolic Links) | Linuxize 3: How to Create and Use Symbolic Links (aka Symlinks) on Linux – How-To Geek 4: Symbolic Links in Unix/Linux – Stack Abuse

Explanation
Compiling an application from source code allows for customization of the binary to a system’s particular needs, including optimization for specific hardware and enabling or disabling certain features. Pre-compiled binaries are quick and easy to install but they don’t allow for such customization.
References:
Understand the difference between a pre-compiled binary and compiling from source

Explanation
The command pkg upgrade is used to update FreeBSD packages to newer versions. It compares the versions of installed packages with those in the repositories and performs upgrades as necessary. The pkg update command is used to update the repository catalog, but it does not perform the actual package upgrades1.
References:
FreeBSD Handbook – Packages and Ports

Explanation
The zpool create command is used to initialize ZFS on one or more block devices and create a storage pool. A storage pool is a collection of devices that provide physical storage and data replication for ZFS datasets. The zpool create command takes the name of the pool and the devices to be added as arguments. For example, zpool create mypool c0t0d0 c0t1d0 c0t2d0 would create a pool named mypool with three devices. The other options are either invalid or do not initialize ZFS. References: 1:
https://www.comptia.org/training/books/a-core-1-220-1101-study-guide, page 302 2:
https://docs.oracle.com/cd/E19253-01/819-5461/gbchx/index.html, section “Creating a ZFS Storage Pool”

Explanation
The setenv command is used to set an environment variable in the csh or tcsh shell. The syntax is setenv VAR VALUE, where VAR is the name of the variable and VALUE is the value to assign to it. The TZ variable is used to specify the timezone for the shell and its subprocesses. To set the timezone to GMT (Greenwich Mean Time), the command is setenv TZ GMT. This will affect the output of commands like date and ls that display time information. The other options are either invalid syntax or belong to other shells, such as bash or sh.
References:
setenv – Linux setenv command help and examples1
TZ – FreeBSD Environment Variables2

Explanation
The /etc/newsyslog.conf file is the configuration file for the newsyslog command, which is used to rotate log files on BSD systems. The newsyslog command is typically run by cron at regular intervals to check if any log files need to be rotated based on the criteria specified in the /etc/newsyslog.conf file. The file contains a series of entries, one per line, that define the log file name, the owner and group, the mode, the count, the size, the when, the flags, and the pidfile for each log file. For example, the following entry in the /etc/newsyslog.conf file:
/var/log/messages root:wheel 644 7 * @T00 Z /var/run/syslog.pid
means that the /var/log/messages file is owned by root and belongs to the wheel group, has the mode 644, is rotated 7 times, has no size limit, is rotated at midnight every day, is compressed after rotation, and the process ID of syslogd is read from /var/run/syslog.pid and sent a signal to reopen the log file.
The other options are either invalid files or belong to other purposes. For example, /etc/logs.conf is not a valid file, /etc/rc.logd is a startup script for the log daemon, /etc/rc.d/syslogd is a startup script for the syslog daemon, and /etc/syslog.conf is the configuration file for the syslog daemon.
References:
[newsyslog.conf] – FreeBSD newsyslog.conf(5) Manual Page
[newsyslog] – FreeBSD newsyslog(8) Manual Page
[Log File Rotation] – FreeBSD Handbook

Explanation
Permissions involve read, write, and execute roles that can be assigned to the owner, a group, or other users1.To use the chmod command, you must specify the permission you want to set and the file or directory you want to modify1.For example,chmod +rwx filenameto add permissions,chmod -rwx directorynameto remove permissions, orchmod +x filenameto allow executable permissions2.
There are two ways to specify the permissions with the chmod command: symbolic notation and numeric notation1.Symbolic notation uses letters and symbols to represent the user classes and the permissions1.Numeric notation uses octal numbers (0-7) to represent the permissions for each user class1.Each octal digit corresponds to a combination of read , write (w), and execute (x) permissions, as shown in the table below3:
Octal digit
Binary representation
Permissions
0
000
–
1
001
-x
2
010
-w-
3
011
-wx
4
100
r-
5
101
r-x
6
110
rw-
7
111
rwx
To use numeric notation, you need to provide three octal digits, one for each user class (owner, group, and others)1.For example,chmod 644 filenamemeans that the owner has read and write permissions (6), the group has read permissions (4), and others have read permissions (4)1.
In this question, the desired permission for the file text.txt is 750, which means that the owner has read, write, and execute permissions (7), the group has read and execute permissions (5), and others have no permissions (0)1. Therefore, the correct chmod command to change the permission of the file text.txt to 750 ischmod text.txt 750.
References:1: Chmod Command in Linux (File Permissions) | Linuxize2: How to change directory permissions in Linux | Pluralsight3: How to Use the chmod Command on Linux – How-To Geek

Explanation
The command cp SI 52 in the Bourne shell script copies the file named by the value of SI to the file named 52.
The SI is a positional parameter that represents the first argument passed to the script when it is executed.
Positional parameters are numbered from 1 to 9, and can be accessed by using the dollar sign $ followed by the number. For example, $1 is the first positional parameter, $2 is the second, and so on. Therefore, the SI in the script is equivalent to $1, and it represents the first argument passed to the script. The correct answer is D.
A positional parameter. References:
[Positional Parameters – FreeBSD]
[Shell Scripting Tutorial – Positional Parameters]

sysrc
Explanation
The sysrc command is used in FreeBSD and NetBSD to manage system-wide daemon and service settings, including those that are started at boot time. It allows administrators to safely edit system rc files, such as /etc/rc.conf, where services to be started at boot time are specified1.
References:
FreeBSD Handbook – rc.conf
FreeBSD Man Pages – sysrc

Explanation
The swapctl command is used to list, add, or delete swap devices on BSD systems. It can also display the total amount of swap space available and used. The swapctl command takes various options to perform different actions, such as -l to list the swap devices, -a to add a swap device, -d to delete a swap device, and -s to show the swapsummary. The other options are not valid BSD commands for managing swap devices. References:
swapctl(8) – OpenBSD manual pages
FreeBSD Handbook – Chapter 19. The FreeBSD Booting Process
FreeBSD Handbook – Chapter 9. Configuring the FreeBSD Kernel

Explanation
According to the BSD disklabel documentation1, the device name for a BSD disk slice consists of three parts:
the disk name, the partition letter, and the slice number. The disk name is determined by the driver and the order of detection, and it usually follows the pattern of sdX, where X is a letter from a to z. The partition letter is a lowercase letter from a to p, excluding c, which is reserved for the whole disk. The slice number is a decimal number from 0 to 15, indicating the MBR partition that contains the BSD disklabel. Therefore, the device name for the first BSD disk slice in the disk label on the first partition on the second SATA disk on OpenBSD is /dev/sdlp2d, where sdl is the disk name, p is the partition letter, and 2 is the slice number.
References1: BSD disklabel – Wikipedia

Explanation
The wq! command is used to save a file and quit the vi editor, even if the file is read-only. The w command means write, the q command means quit, and the ! command means force. By combining these commands, the vi editor will override the file permissions and save the changes to the file, then exit the editor. The other options are either invalid syntax or do not force the write operation. For example, wq will save and quit only if the file is writable, ql will quit without saving, and fw! will force write but not quit. References:
[vi] – FreeBSD vi(1) Manual Page
[wq!] – How to save a file in vi / vim editor in Linux / Unix

Explanation
The inetd.conf file is the configuration file that needs to be edited before the TFTP service will start on a BSD system. The inetd daemon handles the TFTP service and other network services, and its configuration file contains settings that determine howthese services are managed. To enable the TFTP service, the corresponding entry in inetd.conf must be uncommented and properly configured. References:
FreeBSD Handbook – inetd
Linux Professional Institute BSD Specialist Exam Objectives

Explanation
The directories that contain start scripts for services on FreeBSD are /usr/rc.d/ and /usr/local/etc/rc.d/. The
/usr/rc.d/ directory contains the system-provided scripts for the base system services, such as cron, sshd, syslogd, etc. The /usr/local/etc/rc.d/ directory contains the scripts for the additional services installed from ports or packages, such as apache, mysql, nginx, etc. These scripts follow the BSD rc.d framework, which allows for fine-grained control and customization of the startup process. The scripts are invoked by the main
/etc/rc script, which sources the /etc/rc.conf file for configuration options
https://docs.freebsd.org/en/articles/rc-scripting/

Explanation
The excerpt C is a valid if condition in the Bourne shell because it uses the correct syntax and operators for the test command. The syntax of the if statement in the Bourne shell is:
if test-commands; then consequent-commands; [elif more-test-commands; then more-consequents;] [else alternate-consequents;] fi The test-commands are any commands that return a status of 0 (true) or non-zero (false). The test command is a common way to perform various tests on files, strings, and numbers. The test command has the following format:
test expression
The expression consists of one or more primaries, which are unary or binary operators that evaluate to true or false. The primaries can be combined with the following operators:
! expression: Logical NOT expression -a expression: Logical AND expression -o expression: Logical OR ( expression ): Parentheses for grouping The excerpt C uses the test command with the following expression:
“$var” = “test”
This expression tests if the value of the variable $var is equal to the string “test”. The = operator is a string comparison operator that returns true if the strings are equal. The double quotes around the variable and the string are used to prevent word splitting and globbing by the shell. The spaces around the operator are also required by the test command.
The excerpt C also uses the correct syntax for the then and fi keywords, which mark the beginning and the end of the if statement. The then keyword must be on the same line as the test command, or on a new line after a semicolon. The fi keyword must be on a new line.
The other excerpts are invalid for various reasons:
The excerpt A uses the && operator instead of the -a operator for logical AND. The && operator is a shell operator that executes the second command only if the first command succeeds. The test command does not recognize the && operator as a valid argument. The excerpt A also uses the != operator instead of the -ne operator for numeric comparison. The != operator is a string comparison operator that returns true if the strings are not equal. The -ne operator is a numeric comparison operator that returns true if the numbers are not equal.
The excerpt B uses the [ [ construct instead of the test command. The [ [ construct is a shell keyword that performs conditional expressions similar to the test command, but with some extensions and differences. The [ [ construct is not part of the POSIX standard and is not supported by all shells. The Bourne shell does not support the [ [ construct, and will treat it as a command name. The excerpt B also uses the wrong syntax for the then keyword, which must be on a new line or after a semicolon.
The excerpt D uses the wrong syntax for the test command, which requires a space after the opening bracket and before the closing bracket. The excerpt D also uses the wrong syntax for the fi keyword, which must be on a new line.

Explanation
The file that defines the IP address of the default gateway on a FreeBSD system is /etc/rc.conf. This file contains various system configuration options, including network settings. To set the default gateway, the defaultrouter variable is used, followed by the IP address of the gateway. For example, defaultrouter=”192.168.1.254″. This setting will be persistent across reboots.
References
FreeBSD Set a Default Route / Gateway – nixCraft
Chapter 34. Advanced Networking | FreeBSD Documentation Portal
Static default gateway on FreeBSD 8.0 – Super User