单项选择题 Given the regular expression: 64900 . (65400-65410) Which AS Path matches the given regularexpression?（）

多项选择题 Which two are valid fields in an IPv6 header?（）

单项选择题 You have a firewall filter applied in an inbound direction on a customer interface. You would like this filter to protect your network from a spoofed denial of service attack. Which action should be configured to accomplish your goal?（）