https://documentation.suse.com/sles/12-SP4/html/SLES-all/cha-grub2.html

To add two new custom items to the GRUB2 boot menu, you should modify the /boot/grub2/custom.cfg file. This file can contain custom menu entries that will be added to the end of the GRUB2 menu. The syntax and format of this file are similar to /boot/grub2/grub.cfg file. You do not need to run grub2-mkconfig after modifying this file. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-grub2-custom.html

The file that contains the list of DNS servers SLES will contact is /etc/resolv.conf. This file specifies one or more nameserver addresses that will be used to resolve hostnames to IP addresses. It may also contain other options such as search domains, sort lists, etc. The /etc/resolv.conf file can be generated automatically by network configuration tools or edited manually by the administrator. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-network-dns.html#sec-network-dns-resolv.conf

The command that allows you to create an alias command is alias. The alias command can be used to define a short name or abbreviation for another command or sequence of commands. The syntax of the alias command is alias name=‘command’. For example, alias c=‘clear’ will create an alias named c for the clear command. You can then type c to run the clear command. To remove an alias, you can use unalias name. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-bash.html#sec-bash-alias

https://documentation.suse.com/sles/12-SP4/html/SLES-all/cha-security-acls.html

The three permissions available on posix file systems are read, write, and execute. The read permission allows the user to view the contents of a file or directory. The write permission allows the user to modify or delete a file or directory. The execute permission allows the user to run a file as a program or change into a directory. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-file-permissions.html#sec-file-permissions-types

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 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

The execute permission on a directory means you can use the cd command to change into the directory. It also means you can access the files and subdirectories inside the directory, if you have read permission on them. The execute permission does not affect the visibility or exportability of the directory. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-file-permissions.html