单项选择题
An OSPF non-backbone area follows external routes to be flooded within the area. These external routes are propagated into other areas. However， external routes from other areas are not allowed to enter this area. Which type of OSPF area does this describe？（）
A.stub area B.transit area C.border area D.not-so-stubby area
单项选择题 InJUNOSsoftware，whichcommandisusedtoconfigureTEDsupportforOSPF？（）
单项选择题 Whatisrequiredtoenabletheuseofmetricslargerthan63fortrafficengineeringinIS-IS？（）
单项选择题 WhichisastepintheJUNOSsoftwareCSPFalgorithm？（）
