哪两个文件控制访问crontab命令（） A: /etc/cron/cronusers B: /var/crom/cronnousers C: /etc/cron.d/cron.allow D: /etc/cron.d/cron.deny

哪种调度命令可以多次执行? A: cron B: at C: batch D: cron、at、batch

cron 后台常驻程序 (daemon) 用于( )

如何启用记录cron行为日志功能？

拒绝来自主机192.168.5.5 的数据包的语句为（ ）。 A: access-list deny 192.168.5.5 0.0.0.0 B: access-list deny host 192.168.5.5 C: access-list deny 192.168.5.5 D: access-list deny 192.168.5.5 255.255.255.255

在ACL配置中，用于指定拒绝某一主机的配置命令有（） A: deny 192.168.12.2 0.0.0.255 B: deny 192.168.12.2 0.0.0.0 C: deny host 192.168.12.2 D: deny any

​下列命令中，正确的是：‌ A: access-list 1 deny ip 172.16.1.3 0.0.0.0 B: access-list 101 deny ip 172.16.1.3 0.0.0.0 C: access-list 1 deny host 172.16.1.3 D: access-list 101 deny 172.16.1.3 0.0.0.0

经理拒绝给他解释的机会。(deny)The manager _______(deny)him the chance to explain.

According to the passage, living science is impossible with, out widespread belief in the existence of A: To believe in the instinct. B: To deny the instinct of science. C: To deny the rationality of science. D: To deny the rationality of the instinct.

你需要创建一个标准访问控制列表用来拒绝主机172.16.198.94/19所在的子网，表示错误的有（）。 A: Aaccess-list 10 deny 172.16.192.00.0.31.255 B: Baccess-list 10 deny 172.16.0.00.0.255.255 C: Caccess-list 10 deny 172.16.172.00.0.31.255 D: Daccess-list 10 deny 172.16.188.00.0.15.255 E: Eaccess-list 10 deny 172.16.192.00.0.15.255