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NEW QUESTION # 70
Which of the following is true about IPv6?
- A. For IPv6, UDP and TCP have been replaced by the Rapid Transmission Protocol RTP.
- B. IPv4 addresses can be used without any change with IPv6.
- C. With IPv6, the TCP port numbers of most services have changed.
- D. IPv6 no longer supports broadcast addresses.
- E. IPv6 no longer supports multicast addresses.
Answer: D
NEW QUESTION # 71
A user was notgiven permission to use the CRON schedulingsystem. What file needs to be modified to provide that access? (Please specify the full path to the file)
Answer:
Explanation:
/etc/cron.allow
Explanation:
The /etc/cron.d/cron.allow file is a text file that contains the names of the users who are allowed to use the crontab command to create and manage their own cron jobs12. If this file exists, only the users listed in it can use the crontab command, and all other users are denied access12. If this file does not exist, the /etc/cron.d/cron.deny file is checked to see which users are not allowed to use the crontab command12. If neither file exists, only the root user can use the crontab command12.
To modify the /etc/cron.d/cron.allow file, the root user can use any text editor to add or remove the names of the users who will be allowed to use the crontab command1234. For example, to allow the user frank to use the crontab command, the root user can append the name frank to the /etc/cron.d/cron.allow file1234. The root user must always be included in this file, otherwise the superuser access to the crontab command will be denied4.
References: 1: Linux At, Batch, Atq, Atrm Command Help and Examples - Computer Hope 2: 107.2 Lesson 1
- Linux Professional Institute Certification Programs 3: /etc/cron.allow - Linux Bash Shell Scripting Tutorial Wiki - nixCraft 4: Controlling Access to crontab (System Administration Guide ... - Oracle
NEW QUESTION # 72
Which file inside the CUPS configuration directory contains the definition of the printers?
- A. cupsd.conf
- B. snmp.conf
- C. printers.conf
- D. printcap.conf
- E. cups-devices.conf
Answer: C
Explanation:
The printers.conf file inside the CUPS configuration directory contains the definition of the printers. It is a text file that lists the names, locations, descriptions, and options for each printer queue. Each printer queue has a corresponding <Printer> or <DefaultPrinter> section in the file. The file is normally located in the /etc/cups directory and is automatically updated by the cupsd (8) daemon when printers are added or modified. The file can also be edited manually, but the changes will not take effect until the cupsd daemon is restarted or the command cupsctl --reload-config is issued. References:
* cups-files.conf - file and directory configuration file for cups
* [printers.conf - printer configuration file for cups]
NEW QUESTION # 73
Your senior systems administrator asks you to set up a new machine with Apache listening on port 8088.
Which Apache config file would you edit to change the default port to 8088?
- A. httpd.conf
- B. inet.conf
- C. srm.conf
- D. access.conf
Answer: A
NEW QUESTION # 74
After issuing:
function myfunction { echo $1 $2 ; }
in Bash, which output does:
myfunction A B C
Produce?
- A. C B A
- B. A B C
- C. A B
- D. A C
- E. B C
Answer: C
Explanation:
In Bash, a function is a block of code that can be invoked by its name. A function can take arguments, which are passed to the function as positional parameters. The $1 variable refers to the first argument, $2 to the second argument, and so on. The function can access the number of arguments passed to it by using the $# variable. In this case, thefunction myfunction simply echoes the first and second arguments to the standard output. Therefore, when the command myfunction A B C is executed, the output is A B, since the third argument C is ignored by the function. References:
* [LPI Linux Essentials - Topic 103: Command Line Basics]
* [Bash Functions]
NEW QUESTION # 75
What is true regarding the command sendmail?
- A. It is only available when the sendmail MTA is installed.
- B. With any MTA, the sendmail command must be run periodically by the cron daemon.
- C. The sendmail command prints the MTAs queue history of which mails have been sent successfully.
- D. All MTAs, including Postfix and Exim, provide a sendmail command.
Answer: D
Explanation:
The sendmail command is a generic interface to various mail transfer agents (MTAs), such as Sendmail, Postfix, Exim, Qmail, etc. The sendmail command is used to send emails from the command line or from other programs that need to deliver emails. The sendmail command accepts various flags and parameters to specify the sender, recipient, subject, body, and attachments of the email. The sendmail command also reads the standard input for the email content if no file is specified. The sendmail command is part of the sendmail package, which is the original and most widely used MTA for Unix-like systems. However, other MTAs, such as Postfix and Exim, also provide a sendmail command for compatibility reasons. The sendmail command provided by these MTAs may have slightly different syntax and options, but they all support the basic functionality of sending emails. Therefore, the statement that all MTAs, including Postfix and Exim, provide a sendmail command is true123.
The other statements are false. The sendmail command does not need to be run periodically by the cron daemon, as it is not a daemon itself, but a command-line tool. The sendmail command does not print the MTA's queue history, but rather sends the email to the MTA for delivery. The sendmail command is not only available when the sendmail MTA is installed, but also when other MTAs that provide a sendmail command are installed. Reference: 1: Linux Sendmail Command Help and Examples - Computer Hope 2: Send Email in Linux from Command Line | DigitalOcean 3: 5 Ways To Send Email from Linux Command Line - TecAdmin
NEW QUESTION # 76
Which of the following options in the chrony configuration file define remote time sources?
(Choose two.)
- A. pool
- B. remote
- C. server
- D. source
- E. clock
Answer: A,C
NEW QUESTION # 77
What is a purpose of an SSH host key?
- A. It is the root key by which all user SSH keys must be signed.
- B. It authenticates any user that logs into a remote machine from the key's host.
- C. It must be sent by any SSH client in addition to a user key in order to identify the client's host.
- D. It provides the server's identity information to connecting SSH clients.
- E. It is used by system services like cron, syslog or a backup job to automatically connect to remote hosts.
Answer: D
Explanation:
An SSH host key is a cryptographic key used for authenticating computers in the SSH protocol. Host keys are key pairs, typically using the RSA, DSA, or ECDSA algorithms. Public host keys are stored on and/or distributed to SSH clients, and private keys are stored on SSH servers. Each host (i.e., computer) should have a unique host key. Host keys are used for authentication towards the connecting client, analogous to user SSH keys. Host keys are generated using asymmetric encryption algorithms like RSA, DSA, or ECDSA algorithms12. When a client connects to the host, the host sends its public host key to the client, and the client verifies that the host key matches the one stored in its known hosts file. If the host key is unknown or has changed, the client will display a warning and prompt the user to accept or reject the host key. This is to prevent man-in-the-middle attacks, where an attacker intercepts the connection and pretends to be the legitimate host. The other options are either incorrect or irrelevant to the purpose of an SSH host key. References:
* What is an SSH Host Key & How are They Configured?, What are SSH Host Keys? section
* SSH Host Key Management Demystified, What are SSH host keys? section
* What is SSH host key - omnisecu.com, first paragraph
NEW QUESTION # 78
FILL BLANK
Which file, if present, must contain all users that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)
Answer:
Explanation:
crontab
NEW QUESTION # 79
What is true regarding the file ~/.forward?
- A. Using ~/.forward, root may configure any email address whereas all other users may configure only their own addresses.
- B. When configured correctly, ~/.forward can be used to forward each incoming mail to more than one other recipient.
- C. As it is owned by the MTA and not writable by the user, it must be edited using the editaliases command.
- D. After editing ~/.forward the user must run newaliases to make the mail server aware of the changes.
Answer: B
Explanation:
The file ~/.forward is a text file that contains one or more email addresses to which the incoming mail for the user will be forwarded123. The file is owned by the user and can be edited with any text editor123. The file does not require any special syntax or commands, just a list of email addresses separated by commas or newlines123. For example, if the user wants to forward their mail to [email protected] and [email protected], they can create a ~/.forward file with the following content:
[email protected], [email protected]
The MTA will read the ~/.forward file and send a copy of each incoming mail to the specified addresses123. Therefore, the correct answer is D. When configured correctly, ~/.forward can be used to forward each incoming mail to more than one other recipient.
The other options are false regarding the file ~/.forward. The file is not owned by the MTA and does not need to be edited with the editaliases command, which is used to edit the system-wide aliases file, not the user-specific ~/.forward file4. The user does not need to run newaliases to make the MTA aware of the changes, as the MTA will check the ~/.forward file every time a mail is delivered to the user123. The newaliases command is used to rebuild the system-wide aliases database, not the user-specific ~/.forward file4. The file ~/.forward does not have any restrictions on the email addresses that can be used for forwarding, as long as they are valid and reachable123. The root user can also use the ~/.forward file to forward their mail, but it is not recommended for security reasons.
NEW QUESTION # 80
What is true about the ntpdate command?
- A. It sends the local system time to one or many remote NTP time servers for redistribution.
- B. It queries one or more NTP time servers and adjusts the system time accordingly.
- C. It is the primary management command for the NTP time server.
- D. It can be used by any user to set the user clock independently of the system clock.
- E. It updates the local system's date (i.e. day, month and year) but not the time (i.e. hours, minutes, seconds).
Answer: B
NEW QUESTION # 81
On a system running the KDE Display Manager, when is the /etc/kde4/kdm/Xreset script automatically executed?
- A. When KDM crashes
- B. When X is restarted
- C. When KDM starts
- D. When a user's X session exits
- E. When X crashes
Answer: D
NEW QUESTION # 82
Which of the following features are provided by SPICE? (Choose two.)
- A. Accessing graphical applications on a remote host.
- B. Replacing Xorg as local X11 server.
- C. Connecting local USB devices to remote applications.
- D. Uploading and running a binary program on a remote machine.
- E. Downloading and locally installing applications from a remote machine.
Answer: A,C
Explanation:
SPICE is a protocol that allows users to access graphical applications on a remote host, such as a virtual machine or a server, using a client program. SPICE also supports connecting local USB devices to remote applications, such as printers, scanners, or flash drives, using a feature called USB redirection. SPICE does not replace Xorg as the local X11 server, nor does it allow downloading and locally installing applications or uploading and running binary programs from a remote machine. These are features that are provided by other tools, such as SSH, SCP, or RDP. Reference:
Features - spice-space.org
SPICE - Wikipedia
SPICE Model ＜What is SPICE?＞ | Electronics Basics | ROHM
NEW QUESTION # 83
Which of the following commands configure network interfaces based on the system's existing distribution-specific configuration files? (Choose two.)
- A. ifpause
- B. ifup
- C. ifdown
- D. ifstart
- E. ifconf
Answer: B,C
Explanation:
The commands ifdown and ifup are used to configure network interfaces based on the system's existing distribution-specific configuration files. These files are typically located in /etc/network/interfaces or /etc/sysconfig/network-scripts, depending on the Linux distribution. The ifdown command shuts down a network interface, while the ifup command brings up a network interface. These commands can be used to apply changes made to the configuration files without rebooting the system12.
The other commands are not related to network interface configuration. The ifconf command does not exist in Linux. The ifpause and ifstart commands are not standard Linux commands, but they may be aliases or scripts defined by some users or distributions. Reference: 1: NetworkConfigurationCommandLine - Community Help Wiki. 2: [How to Configure Network Static IP Address on RHEL/CentOS 8/7/6].
NEW QUESTION # 84
Which of the following are syslog facilities? (Choose two.)
- A. remote
- B. mail
- C. local5
- D. accounting
- E. postmaster
Answer: B,C
Explanation:
Explanation
NEW QUESTION # 85
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