H31-211 – Huawei Certified Network Associate - HCDA (Carrier IP)

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  Neighbor discovery is equivalent to adjacency establishment.

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  After an OSPF router receives a Hello packet from the peer OSPF router, it checks the parameters in the packet. If the parameters in the packet from the peer OSPF router are consistent with the parameters of this OSPF router, the two OSPF routers become neighbors of each other.

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  After a router receives a Hello packet from the peer router, it becomes the neighbor of the peer router.

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  An OSPF interface broadcasts Hello packets to discover a neighbor.
  
  

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  If the designated port is connected with P2P link, it can make a handshake with the connected bridge and enter the forwarding state immediately after it receives a response.

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  Once a port of the switch which is configured as edge port has been enabled, it will become designated port immediately and transit to forwarding state.

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  If the designated port is connected with P2MP link, it can make a handshake with the connected bridge and enter the forwarding state immediately after it receives a response.

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  A new root port is elected on the non-root switch and the previous old root port is no longer in forwarding state. Moreover the designated port of the segment which connects with the new root port already starts to forward the data. In this case, the new root port can enter forwarding state immediately.
  
  

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  PAP is used for user authentication.

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  LCP negotiates on authentication information.

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  IPCP can be used to negotiate on IP addresses and compress information.

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  CHAP performs authentication by exchanging packets twice.