How do IGMPv2 routers maintain cinderband group membership? Multi-select

• A.As soon as the leave message is received, the router immediately deletes the group membership
• B.The router queries a specific group
• C.The router maintains a timeout timer for each group membership, refreshes the timer if the receiver host is received, and deletes the group membership if the timer times out
• D.The router periodically sends a Query message, and after the receiver host receives the Query message, it reports a Report message

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If the receive cache of a switch's gigabit Ethernet interface is full, what protocol does the switch use to know that the remote interface delays sending data frames for a period of time?

• A.8023
• B.8021U
• C.8023af
• D.8023Z
• E.8021D

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What is the wrong description of the function of OSPFv3 protocol authentication?

• A.OSPFv3 authentication relies on IPv6 packet authentication headers and encapsulation security net load headers
• B.OSPFv3 can only establish a security alliance SA using manual mode
• C.The OSPFv3 protocol header removes the Type and Automation fields
• D.Huawei router OSPFv3 IPSec authentication can not only support transmission mode, but also support tunnel mode

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As shown in the figure,

in the context of IPv4 and IPv6, the SEL field in the NET address of the ISIS is always valued as 00?

• A.True
• B.False

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If there are multiple recipients in a multicast group, the administrator enables the IGMP-Snooping function on the switch connecting the recipient, and when the receiver receives the universal group query packet of the queryer from the switch, how should multiple recipients respond?

• A.All recipients will respond to the Report message
• B.All recipients will respond to Report messages only if ICMPV2 is running.
• C.The first recipient whose response time time expires sends the Report message, the other receivers do not.
• D.All recipients will respond to the Report message only if IGMPvl is running.

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