单项选择题
When a local loopback is activated on a PPP serial link, what indicates that the local interface is good?（）
A.A ping to the local address succeeds. B.A ping to the remote address succeeds. C.A ping to the remote address received a 'TTL expired' message. D.The interface shows a flag indicating that a loop is detected.
单项选择题 Which command would initiate a loopback on a Gigabit Ethernet interface ge-0/0/0?（）
多项选择题 If you want to test if fragmentation is causing problems on the network, which two ping command options are useful?（）
多项选择题 Which two statements regarding traceroute on JUNOS devices are correct?（）
