Mainstream Layer 2 tunneling technologies include VXLAN TRILL, NVGB and MPLS.

• A.FALSE
• B.TRUE

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In EPIM-SM, the following description of the PIM Join message is correct?

• A.PIM Join messages for the multicast tree are only sent when the multicast tree is first established
• B.PIM Join messages are sent every 3 minutes, and status
• C.The PIM Join message is sent every 60 seconds to refresh the status of the upstream router mroute for the multicast tree
• D.The upstream router sends a PIM Join acknowledgment in response to each PIM Join message received from the downstream router

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Is the following GR description of ISIS correct?

• A.ISIS's GR defines a new TLV structure to support this feature.
• B.The GR feature of AISIS is turned on by default.
• C.ISIS's GR has a total of four timers.
• D.ISIS's GR notifies of events and maintains neighbor relationships through CSNP messages.

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In the following topology diagram, R1 can access the Internet through R2 and R3, R1 and R2, R1 and R1 An EGP connection is established between R3 , and R2R3 belongs to the same AS, each via BGP Publishing a default route that requires R1 to visit lnternet's traffic preference R2, can the following practices be achieved?

• A.R2 specifies that the peer R1 sets the local priority to 150 in the export direction
• B.R2 specifies that the peer R1 sets the MED property to 150 in the export direction
• C.R1 specifies that the peer R2 beats the local priority in the import direction to 150
• D.R1 specifies that the peer R3 sets the MED property to 150 in the import direction

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Two VTEPs in an XLAN can identify a VXLAN tunnel, and this VXLAN tunnel between the VTEPs will be covered by two NDEs is common to all VNI.

• A.True
• B.False

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