A.immediately after receiving the first packet on the shared tree for a given （S，G）
B.after receiving over 1 kb/s traffic onthe shared tree for a given （S，G）
C.10 seconds after receiving the first packet on the shared tree for a given （S，G）
D.30 seconds after receiving the first packet on the shared tree for a given （S，G）
E.after receiving over 10 kb/s traffic onthe shared tree for a given （S，G）
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A.MAC over MPLS
B.L2TPV3
C.802.1 QinQ
D.Ethernet over MPLS
E.GRE
A.Updating the pseudonode LSP
B.maintaining pseudonode link-state information
C.creating the pseudonode
D.flooding LSPs over the LAN
E.election of the pseudonode
A.routing primary language
B.routing policy language
C.routing police language
D.routing program language
E.routing protocol language
A.modular line cards
B.shelf controllers
C.route processors
D.service processors
E.distributed service cards
A.3
B.4
C.5
D.2
E.6
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Which two statements about Layer 3 MPLS VPN are true？（）
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In optical transmission systems， chirped lasers are used for the purpose of：（）.
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