多项选择题
A. IP protocol
B. IP time-to-live
C. source and destination IP address
D. source and destination MAC address
E. source and destination TCP/UDP port
单项选择题 You want to create a policy allowing traffic from any host in the Trust zone to hostb.example.com(172.19.1.1) in theUntrust zone. How do you do create this policy? （）
多项选择题 Click the Exhibit button. host_a is in subnet_a and host_b is in subnet_b. Given the configuration shown in the exhibit, which statement is true about traffic from host_a to host_b?（）
多项选择题 Which two are characteristics of link-state routing protocols?（） (Choose two.)