What is the typical marked DSCP value for a voice signaling packet in VoIP technology？（）

A.BE
B.AF41
C.AF21
D.EF
E.AF31

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Which three statements about the route target （RT） are true？（）

A.The RT is a BGP extended community.
B.The RT is an 8-byte field that is prefixed to an IPv4 address to make it a unique VPNv4 address.
C.When a VPN route that is learned from a CE router is injected into BGP， one or more RTs are associated with it
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Which three of these are types of Ethernet Virtual Connections （EVCs） in the MEF concept？（）

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B.point-to-point EVC （E-Line）
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D.hub spoke EVC （E-Tree）
E.multipoint-to-multipoint EVC （E-LAN）

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Cisco IOS XR has implemented a nonstop routing feature so that when RP failover occurs， the routinginformation can be recovered locally. Which protocol does not support the NSR feature？（）

A.OSPF
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D.IS-IS
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