单项选择题
A.ip
B.tcp
C.ICMP
D.数据侦听与冲突控制CSMA/CD
单项选择题 In which solution is a router ACL used？（）
单项选择题 Refer to the exhibit. Which value will be configured for Default Gateway of the Local Area Connection?（）
单项选择题 Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?（）