阅读以下说明,回答问题1~问题5,将解答填入对应的解答栏内。 [说明] 在Linux环境下使用的FTP服务器软件主要有Wu-FTP、NcFTP和ProPTP三种,其中Wu-FTP是目前最流行的一种免费FTP服务器软件,某单位就使用该软件架设了一台FTP服务器,下面是该服务器主要配置文件/etc/ftpaccess的主要内容。 [配置文件/etc/ftpaccess的主要内容] loginfails 5 class local real* class remote anonymous guest* limit remote 200 Any /etc/ftpd/toomany.msg message/etc/ftpd/welcome.msg login compress yes local remote tar yes local remote private yes passwd-check rfc822 enforce log commands real log transfer anonymous guest inbound outbound log transfer real inbound shutdown/etc/ftpd/shut.msg delete no anonymous.guest overwrite no anonymous,guest rename no anonymous chmod no anonymous,guest umask no anonymous upload/home/ftpd*no upload/home/ftpd/bin no upload/home/ftpd/etc no upload/home/ftpd/pub yes real 0644 dirs upload/home/ftpd/incoming yes real guest anonymous 0644 dirs alias in/incoming email admin@abc.net.cn email ferd@sina.com.cn deny *.com.tw /etc/ftpd/deny.msg 文件/etc/ftpaccess中,loginfails5一行的含义是什么?