Into which protocol are LDP hello messages encapsulated？（）

单项选择题Which represents a correct PE-PE BGP configuration for an L3 VPN？（）

A.A
B.B
C.C
D.D

单项选择题InJUNOSsoftware，whatisrequiredtoredistributeRIProutesintoOSPF？（）

A.Apply an export policy in RIP
B.Apply an import policy in RIP
C.Apply an export policy in OSPF
D.Apply an import policy in OSPF

单项选择题WhichLSAistheType10？（）

A.Router LSA
B.Opaque LSA
C.AS attributes LSA
D.ASBR summary LSA
E.Network summary LSA

单项选择题AnOSPFnon-backboneareaallowsexternalroutestobefloodedwithinthearea.Theseexternalroutesarepropagatedintootherareas.However，externalroutesfromotherareasarenotallowedtoenterthisarea.WhichtypeofSPFareadoesthisdescribe？（）

A.stub area
B.transit area
C.border area
D.not-so-stubby area

多项选择题WhichtwomechanismscontrolroutedistributionbetweenPEroutersina2547bisVPN？（）

A.Site ID
B.Policies
C.Circuit ID
D.Extended communities