Which configuration command is used to make the ERX Edge Router an NTP server？（）

单项选择题Whichcommandisusedtoexecuteamacrocalledsetup.mac？（）

A. macro setup
B. macro setup.mac
C. run macro setup
D. run macro setup.mac

单项选择题WhichconfigurationcommandremovesalllogfilterscurrentlyconfiguredontheERXEdgeRouter？（）

A. no log here
B. no log fields
C. no log filters
D. no log severity

单项选择题LogmessagesareappearingveryquicklyontheconsoleofyourERXEdgeRouter.WhichPrivilegedExeccommanddisablesreal-timeconsolelogging？（）

A. no log here
B. no log console
C. destination console severity 7
D. destination console logging off

单项选择题WhichcommanddisplaystheresultsofaloopbacktestyouexecutedonaCT3linemoduleinslot5，port0，t1number4？（）

A. show interface 5/0：4
B. show interface 5/0：4/1
C. show controllers t3 5/0：4
D. show controllers t3 5/0：4/1

单项选择题WhatisthepurposeoftheOSPFhellopacket？（）

A. advertises reachable networks
B. acknowledges the receipt of update packets
C. establishes and maintains neighbor relationships
D. describes the contents of the link-state database