Which of the following are the techniques for improving MPLS BGP VPN reliability? (Multiple choice)

• A.Private network IP routing FRR between the PE and CE
• B.Configure CE dual-homing networking on the access layer.
• C.VPN FRR
• D.VPN GR

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If you run PIM-SM on a multicast network, you need to construct a multicast forwarding tree between the multicast source and the receiver for the receiver to receive multicast data, so the following descriptions are about the constructed multicast forwarding tree, which are the correct options? (Multiple Choice)

• A.The SPT tree is constructed between the RP and the receiver.
• B.The SPT tree is constructed between the multicast source and the RP.
• C.The RTP tree is constructed between the RP and the receiver.
• D.The RPT tree is constructed between the multicast source and the RP.

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Which of the following description about the information of BGP4+ is correct?

• A.Modifying the BCP's router ID will cause the BGP connection between the routers to be re-established.
• B.Bgp4+ can use dampening command to suppress IBGP routes.
• C.The Next Hop attribute in BCP4+ is represented by the Pv6 address, which can be the link-local address of the next hop.
• D.bGP4+ does not support automatic route aggregation.

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In an MPLS IBGP VPN environment, if LDP distributes labels only through BGP, the MPLS labels of the packets are at most two layers.

• A.True
• B.False

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In the lab network, the network is built as follows. SW1 is the default configuration and SW2 disables STP. Which of the following description about scenario is correct?

• A.G0/0/2 of sw1 enters Discarding state
• B.G0/0/1 of sw2 enters Discarding state
• C.G0/0/2 of sw2 enters Discarding state
• D.G0/0/1 of SW1 enters Discarding state
• E.No interface is blocked

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