WhichthreeauthenticationoptionsdoesIS-ISsupport？（）……

多项选择题WhichfourcomponentsmakeuptheNetworkEntityTitle（NET）ofanIS-ISrouter？（）

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？（）

A.0
B.1
C.2
D.3

单项选择题InIS-IS，howdoestherestartingrouterinformitshelpersthatarestartseventoccurred？（）

A.Sending out a graceful restart PDU
B.Sending an LSP that contains no TLVs.
C.Sending out a restarts TLV with the RR bit set.
D.Reflooding its LSP with a maximum sequence number.

单项选择题YouhaveaLevel1-onlyrouter（RouterA）inIS-ISarea49.0001.HowdoesRouterAlearnhowtogettoIPprefixedinotherareas？（）

A.Router A must have a Level 2 adjacency with the Level 1/Level 2 router in area 49.0001.
B.The Level 1/Level 2 router in area 49.0001 sets the "attached" bit in the Level 2 LSP it floods into area 49.0001.
C.The Level 1/Level 2 router in area 49.0001 sets the "attached" bit in the Level 1 link-state PDU （LSP） it floods into area 49.0001.
D.The Level 1/Level 2 router in area 49.0001 advertises these prefixed into area 49.0001 using a Level 2 LSP it floods into the area.

多项选择题WhichtwoarevalidIS-ISPDUtypes？（）

A.broadcast hellos
B.Level 1 LAN hellos
C.Point-to-point hellos
D.Level 2 point-to-point hellos