多项选择题
A.AF
B.AFI
C.MAC
D.Area
E.SysID
F.A-Selector
G.N-Selector
H.IP-address
单项选择题 RoutersAandBareconnectedwithapoint-to-pointOC-3interface.Eachrouter’sOC-3interfaceisconfiguredforbothLevel1andLevel2.Theroutersareconfiguredindifferentareas.HowmanyIS-ISadjacenciesexistbetweenthetworouters？（）
单项选择题 InIS-IS，howdoestherestartingrouterinformitshelpersthatarestartseventoccurred？（）
单项选择题 YouhaveaLevel1-onlyrouter（RouterA）inIS-ISarea49.0001.HowdoesRouterAlearnhowtogettoIPprefixedinotherareas？（）