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 how these 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

Permissions involve read, write, and execute roles that can be assigned to the owner, a group, or other users 1 . To use the chmod command, you must specify the permission you want to set and the file or directory you want to modify 1 . For example, chmod +rwx filename to add permissions, chmod -rwx directoryname to remove permissions, or chmod +x filename to allow executable permissions 2 .

There are two ways to specify the permissions with the chmod command: symbolic notation and numeric notation 1 . Symbolic notation uses letters and symbols to represent the user classes and the permissions 1 . Numeric notation uses octal numbers (0-7) to represent the permissions for each user class 1 . Each octal digit corresponds to a combination of read ®, write (w), and execute (x) permissions, as shown in the table below 3 :

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 filename means 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 is chmod text.txt 750 .

References : 1 : Chmod Command in Linux (File Permissions) | Linuxize 2 : How to change directory permissions in Linux | Pluralsight 3 : How to Use the chmod Command on Linux - How-To Geek

The /etc/printcap file on a BSD system defines the printers that are available by the Ipr printing system. The Ipr printing system is a BSD-compatible printing system that uses the lpd daemon to manage print jobs and spooling. The /etc/printcap file contains a series of entries, one for each printer, that specify the printer name, device, options, and filters. The format and syntax of the /etc/printcap file are described in the printcap(5) manual page.  References :

About Printing on FreeBSD | The FreeBSD Forums

The BSD Printing Protocol (System Administration Guide, Volume 2) - Oracle

Chapter 11. Printing | FreeBSD Documentation Portal

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]

This command and option can be used to perform a reverse DNS lookup, which is the process of finding the domain name or hostname associated with an IP address. The dig command is a tool that can query DNS servers for various types of records, such as A, MX, NS, PTR, etc. The -x option tells dig to perform a reverse DNS lookup by sending a PTR query to the DNS server. For example, to perform a reverse DNS lookup for the IP address 8.8.8.8, the following command can be used:

dig -x 8.8.8.8

The output of this command will show the PTR record for 8.8.8.8, which is dns.google. This means that the hostname for 8.8.8.8 is dns.google.  Reverse DNS lookups are useful for verifying the identity of a host, checking for mail server configuration, or troubleshooting network problems

The command  netcat  is a versatile networking utility that can be used to read from and write to network connections using TCP or UDP protocols. It is often used for debugging and investigating the network and can be used to connect to a remote TCP service.

References :

BSD Specialist Exam 702 Objectives - Linux Professional Institute

FreeBSD Handbook - Networking

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 upgrades 1 .

References :

FreeBSD Handbook - Packages and Ports

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 nodes 1 2   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