The sync no option ensures that the EEM applet runs asynchronously with respect to the CLI, meaning it does not wait for the CLI command that triggered the event to complete before running. The skip no option means that the CLI command that triggered the event will not be skipped and will be executed normally after the applet runs. This combination is required to prevent entering configuration mode because it allows the applet to run and take action without interrupting or skipping the triggering command.