Which command is used to retrieve the serial numbers of a Juniper device?（）

单项选择题What is used to view status messages sent to a file named test as they are sent?（）

A.monitor start test
B.show log test
C.view log test
D.show test realtime

多项选择题Which three SONET network elements are used for troubleshooting?（）

A.line
B.path
C.circuit
D.section
E.segment

单项选择题When troubleshooting ATM, which command would allow you to test reachability from one side of an ATM cloud to the other?（）

A.ping atm vci 0.100 interface at-0/1/0 end-to-end
B.ping atm vci 0.100 interface at-0/1/0 circuit
C.ping atm vci 0.100 interface at-0/1/0 far-end
D.ping atm vci 0.100 interface at-0/1/0 final-hop

单项选择题Which command would you type to see a concise display of which interfaces are up and which are down?（）

A.show interfaces brief
B.show interfaces status
C.show ip interface brief
D.show interfaces terse

单项选择题In Ethernet networks, duplex mismatches will lower performance. Which error statistics can be seen if a duplex mismatch is present?（）

A.collisions on the full-duplex side; runts on the half-duplex side
B.collisions on the full-duplex side; collisions on the half-duplex side
C.collisions on the half-duplex side; framing errors on the full-duplex side
D.collisions on the half-duplex side; giants on the full-duplex side