H12-221 – HCNP-R&S-IERN (Huawei Certified Network Professional-Implementing Enterprise Routing Network)

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  The high-order 24 bits of a multicast MAC address are 0x01005e while the low-order 23 bits of a multicast MAC address are the low-order 23 bits of a multicast IP address.

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  One multicast MAC address can map 32 different IP multicast addresses.

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  Multicast MAC addresses are used in the link layer to identify receivers that are in the same multicast group.

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  One multicast MAC address can map only one IP multicast address.
  
  

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  The Link ID of point-to-point links are the neighbors Interface IP address.

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  The Link ID of TransNet links are the network address of TransNet network segment.

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  The Link ID of StubNet links are the network address of stub network.

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  The Link ID of virtual links are the neighbor's Router ID of virtual link.
  
  

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  Multicast distribution trees are classified into two types: SFT and RPT.

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  The PIM-SM protocol can generate both RFTs and SPTs.

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  The PIM-55M protocol can generate only SFTs.

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  The PIM-DM protocol can generate both RFTs and SFTs.