单项选择题 You have a firewall filter containing two terms 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 match criterion should be configured ito identify unwanted packets?（）

多项选择题 In the output of show isis adjacency, which three can be displayed under the attributes header? （）

单项选择题 What is the correct virtual link configuration on an OSPF router?（）