Is the following description of the differences between IGMP name versions correct?

• A.For members to leave, IGMPv2/v3 can actively leave, while IGMPvl cannot
• B.IGMPv1 does not support specific group queries, while IGMPv2 does
• C.IGMPv1/2/v3 cannot support the SSM model
• D.IGMPv1/v2 cannot elect the queryer itself, while IGMPv3 can

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When there are multiple rule rules for ACLs in VRP, which of the following statements is true regarding the order of matching? Single choice questions).

• A.By default, matching is based on the principle of "depth first"
• B.By default, matching occurs in the order in which the permit is matched first and denim later.
• C.By default, matching is made from smallest to largest according to the Rule-ID.
• D.There is only one matching order and cannot be modified.

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What are the reasons why the BGP connection is down after it is successfully established? (Single choice questions) Single choice

• A.The mandatory attribute in the route update packet is missing.
• B.After the BGP connection is established, the keepalive message is not received within the negotiated hold time time.
• C.Open message negotiation failed.
• D.The wrong BGP packet was received.

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There is an existing router running OSPF HWL, HW1 interface serial0 is published in zone 1, configure commands under the OSPF process nssa default-route-advertise, based on the previous description, infers which of the following options are correct?

• A.When HW1 injects a default route into Zone 1, HW1's local route table can not contain a single default route
• B.HW1 injects a Type 3 default route into Zone 1
• C.HW1 injects a Type 7 default route into Zone 0
• D.When HW1 injects a default route into zone 1, HW1's local route table needs to answer the default route
• E.HW1 injects a type 7 default route into zone 1

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A router Router LSA is shown in the figure below, and the following statement is incorrect?

• A.The Router ID of this router is 100121
• B.This router has established an adjacency relationship
• C.This router is a DR
• D.This router supports external route ingestion

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