Which CLI command is used to upgrade a Juniper router?（）

单项选择题How is a loopback cleared on interface ge-0 0 0?（）

A.Issue the operational command clear interfaces ge-0/0/0 loopback local.
B.No command is necessary, the loopback times-out in 5 minutes.
C.Issue the configuration command clear interfaces ge-0/0/0 loopback, then commit.
D.Issue the configuration command delete interfaces ge-0/0/0 gigether-options loopback , then commit.

多项选择题Which two loopback types are supported for serial interfaces on Juniper devices?（）

A.Local
B.Far End
C.Remote
D.Bidirectional

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?（）

A.# set interfaces ge-0/0/0 unit 0 loopback
B.# set interfaces ge-0/0/0 gigether-options loopback
C.> set interfaces ge-0/0/0 loopback
D.> loopback 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?（）

A. ttl
B. size
C. rapid
D. do-not-fragment