According to this picture, what can we judge? (Multiple choice)

• A.The device with system-ID ee8a0c2.baf2, its type is Leve1-1
• B.R4 belongs to Leve1-2 only
• C.R4 belongs to Level-1 only
• D.The device whose system-ID is ee8c. a0c2.baf2, and its type is Level-1-2

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As shown in the figure, the MP_BGP neighbor relationship is established between PE1 and PE2 through the Loopback0 interface. After the configuration is completed, it is found that CE1 and CE2 cannot learn routes from each other. Which of the following options will cause this problem? (Multiple choice)

• A.The routing protocol configuration between PF1 or PE2 and the respective CE is incorrect
• B.The LSP tunnel between PE1 and PE2 is not established
• C.PE1 or PE2 is not enabled with neighbors in the BGP-VPNv4 unicast address family view
• D.The VPN instance parameters on PE1 or PE2 are incorrectly configured

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Which of the following functions will affect BGP neighbor establishment? (Multiple choice)

• A.BGP route filtering
• B.BGP authentication
• C.ebgp max hop
• D.BGP GSTM

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In a multi-level RR scenario, a large number of second-level RR are connected to the first-level RR, which may cause the BGP routing table of the first-level RR to overflow. What method can be used to reduce the risk of overflow of the BGP routing table of the first-level RR?

• A.Routing control
• B.Set the same Cluster-lD
• C.ORF
• D.Route aggregation

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EGP authentication can prevent illegal routers from establishing neighbors with BCP routers. BCP authentication can be divided into MD5 authentication and Keychain authentication. Which of the following BGP messages will carry BCGP Keychain authentication information? ((Multiple choice)

• A.Update
• B.Open
• C.Keepalive
• D.Notication

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