https://en.wikipedia.org/wiki/Virtual_Network_Computing#:~:text=VNC%20by%20default%20uses%20TCP,Java%2Denabled%20 web%2Dbrowser .

VNC by default uses  TCP port  5900+ N , [6] [7]  where  N  is the display number (usually :0 for a physical display). Several implementations also start a basic  HTTP   server  on port 5800+ N  to provide a VNC viewer as a  Java applet , allowing easy connection through any Java-enabled web-browser. Different port assignments can be used as long as both client and server are configured accordingly. A HTML5 VNC client implementation for modern browsers (no plugins required) exists too. [8]

The default port a VNC Client uses to connect is TCP 5901. This port corresponds to the first display number (:1) of the VNC server. Each display number has its own port number, starting from 5900. For example, display :2 uses port 5902, display :3 uses port 5903, and so on. The user can specify a different port number if needed. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-vnc-connect.html

The /etc/fstab file contains information about file systems that need to be mounted at boot time or on demand. It specifies the device name, mount point, file system type, mount options, dump frequency, and fsck order for each file system. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-storage-mounting.html#sec-storage-mounting-fstab

The name of the system logging facility in SUSE Linux Enterprise is syslog-ng. It is a flexible and scalable implementation of the syslog protocol that can handle various types of log messages from different sources and destinations. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-syslog.html

Firewalld uses two separated configuration sets, runtime, and permanent configuration.

The runtime configuration is the actual running configuration and it is not persistent on reboots. When the firewalld service starts it loads the permanent configuration which becomes the runtime configuration.

https://www.supportsages.com/everything-you-need-to-know-about-firewalld/#:~:text=Firewalld%20uses%20two%20separated%20configuration,which%20becomes%20the%20runtime%20configuration .

Firewalld maintains two separate configurations: runtime and permanent. The runtime configuration is the current state of the firewall that is applied to the system. It can be changed by various commands and tools without affecting the permanent configuration. The permanent configuration is the persistent state of the firewall that is stored in configuration files. It can be changed by various commands and tools with the --permanent option. The permanent configuration will take effect after reloading firewalld or rebooting the system. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-firewall-firewalld.html#sec-firewall-firewalld-config

The configuration files that have a format that is compatible with the system logging facility in SUSE Linux Enterprise are /etc/syslog.conf and /etc/rsyslog.conf. These files contain rules that specify how to filter and process log messages from different sources and destinations. The /etc/syslog.conf file is used by the traditional syslogd daemon, while the /etc/rsyslog.conf file is used by the more advanced rsyslogd daemon. SUSE Linux Enterprise uses rsyslogd by default, but it can also read /etc/syslog.conf for backward compatibility. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-syslog.html#sec-syslog-config

The file that lists each user’s home directory and login shell is /etc/passwd. This file contains information about each user account on the system, such as user name, password (or an x if using shadow passwords), UID, GID, full name or comment field, home directory path, login shell path, etc. Each line in this file corresponds to one user account and has seven fields separated by colons. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-user-group.html#sec-user-group-files

Log file rotation is the process of compressing or deleting old log files to save disk space and improve performance. The /etc/logrotate.conf file controls the global settings for log file rotation, such as frequency, size limit, compression method, etc. The /etc/logrotate.d/ directory contains configuration files for specific log files that can override the global settings in /etc/logrotate.conf. The /usr/sbin/logrotate program is used to perform log file rotation according to the configuration files. It is usually invoked by a cron job in /etc/cron.daily/logrotate. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-logrotate.html

By default, the VNC Client and the VNC server daemon use a self-signed SSL certificate for secure communications. The VNC server generates a self-signed certificate when it is started for the first time. The VNC Client will prompt the user to accept or reject the certificate when connecting to the server. Alternatively, the user can provide a custom certificate for the VNC server or disable encryption if desired. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-vnc-security.html

The statement that is true regarding the life cycle support for SUSE Linux platform products is that the support for SLE platforms has a 13 year life cycle: 10 years of general support and 3 years of extended support. General support includes security updates, bug fixes, feature enhancements, and technical support. Extended support includes security updates and technical support only. Service packs have a different life cycle depending on their release date and version. References: https://www.suse.com/lifecycle/

Assuming the default value for umask, which is 022, the permissions on new files would be set to 644 and the permissions on new directories would be set to 755. The umask value is subtracted from the base permissions of 666 for files and 777 for directories to determine the actual permissions. For example, 666 - 022 = 644 for files and 777 - 022 = 755 for directories. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-file-permissions.html#sec-file-permissions-umask