Which of the following statements about stack splitting is wrong?

• A.If the main and standby switches are in two stacking systems after the stack is split, the stack system where the original main switch is located will update the topology and re-designate the standby switch. The original standby switch will be promoted to the master in the new stacking system, and the new standby switch will be elected at the same time
• B.If the master and backup switches are still in the same stack system after the stack is split, the slave switches separated from the original master and backup switches will re-elect the master and backup transfer machines due to the timeout of the protocol packets.
• C.After the stack splits, the MAC addresses of the two stacking systems will definitely change immediately
• D.After the split, multiple stack systems will have the same IP address and MAC address. To avoid network failures, the stack will perform MAD detection. The party that fails the MAD detection competition will close all physical ports except for reserved ports.

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The following is a router BGP error output information, which description of this information is wrong?
<HUAWEL>display bgp error Error Type: Peer Error Date/Time:2010-03-2211:40:39 Peer Address:10.1.1.2Error lnfo Router-id conflict

• A.Error Type display because the neighbor relationship False caused
• B.The router's neighbor address is 10.1.1.2.
• C.The error occurred at 11:40:39 on March 22, 2010
• D.False may be caused by the wrong AS number of the peer

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In the OSPF routing domain, in broadcast networks and NBMA networks with at least two routers, one router must be designated as DR and the other as BDR.

• A.TRUE
• B.FALSE

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A switch runs the RSTP protocol, and its related configuration information is shown in the figure. According to the command configuration, please point out that for Instance 1, the role of the switch is:

• A.Unable to judge
• B.Root switch
• C.Non-root switch
• D.Switch

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Regarding the OSPF protocol packets, which of the following statement is false?

• A.OSPF packets are encapsulated in UDP packets, and the port number is 89
• B.The header format of all OSPF packets is the same
• C.All OSPF packet headers carry the Router-ID field
• D.The OSPF protocol uses five types of messages to complete the transmission of routing information

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