To install an FTP server and configure anonymous download for the /var/ftp/pub directory, follow these steps for a typical RHEL-based system: First, configure the YUM repository if it is directed to an already existing local file server. Edit or create a YUM repository configuration file, for example, use the command 'cd /etc/yum.repos.d' and then 'vim local.repo'. In the 'local.repo' file, add the following lines: [local] name=local.repo baseurl=file:///mnt enabled=1 gpgcheck=0. Next, update the YUM cache with 'yum makecache' and then install the vsftpd package using 'yum install -y vsftpd'. Start the vsftpd service with 'service vsftpd start' and ensure it starts on boot with 'chkconfig vsftpd on'. Verify the service configuration with 'chkconfig --list vsftpd'. Modify the vsftpd configuration file with 'vim /etc/vsftpd/vsftpd.conf', setting 'anonymous_enable=YES'. Restart the vsftpd service to apply the changes with 'service vsftpd restart'. This will allow anonymous users to download files from the /var/ftp/pub directory.