Which configuration command removes all log filters currently configured on the ERX Edge Router？（）

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

多项选择题WhatarethethreeOSPFauthenticationmethodssupportedontheERXEdgeRouter？（）

A. null password
B. simple password
C. message digest 5
D. Password Authentication Protocol
E. Challenge Handshake Authentication Protocol

单项选择题WhenconfiguringOSPFontheERX，whatisthedefaultauto-costreference-bandwidthvalue？（）

A. 1 Mbps
B. 10 Mbps
C. 100 Mbps
D. 1000 Mbps