单项选择题
Which item represents the standard IP ACL?（）
A. access-list 50 deny 192.168.1.1 0.0.0.255 B. access-list 110 permit ip any any C. access-list 2500 deny tcp any host 192.168.1.1 eq 22 D. access-list 101 deny tcp any host 192.168.1.1
单项选择题 Which statement about access lists that are applied to an interface is true?（）
单项选择题 Which command enables RSTP on a switch?（）
单项选择题 DNS servers provide what service?（）
