A.routefiltering
B.protecttheroutingengine
C.securingtheroutercontrolplane
D.protectagainsthiddenbridgeloops
E.protectagainstdenialofserviceattacks
参考答案:BCE
A.routefiltering
B.protecttheroutingengine
C.securingtheroutercontrolplane
D.protectagainsthiddenbridgeloops
E.protectagainstdenialofserviceattacks
参考答案:BCE