单项选择题
A.They are used to summarize area routes to other areas.
B.They are used in not-so-stubby areas to propagate external routes.
C.They are used to notify areas of the ASBR.
D.They are flooded to all areas except stub areas （external route）.
单项选择题 DuringtheIPv6addressresolution，anodesendsaneighborsolicitationmessageinordertodiscoverwhichofthese？（）
单项选择题 WhichofthesetablesisusedbyanLSRtoperformaforwardinglookupforapacketdestinedtoanaddresswithinanRFC4364VPN？（）
单项选择题 ArouterisconnectedtoanHDLCcircuitviaaT1physicalinterface.TheSLAforthislinkonlyallowsforasustainedrateof768kb/s.Burstsareallowedforupto30secondsatuptolinerate，withawindowTcof125ms.WhatshouldtheBcandBesettingbewhenusinggenerictrafficshaping？（）