As shown in the figure, three switches SW1, SW2 and SW3, where SW1 is the root bridge, the link between SW1 and SW2 is congested, and SW2 cannot receive the configuration BPDU sent by the root bridge. Which spanning tree protection mechanism does the administrator need to configure to prevent link congestion?

• A.TC-BPDU protection
• B.Root protection
• C.BPDU protection
• D.Loop protection

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Regarding the BGP confederation, which of the following description is wrong?

• A.The sub-AS number in the confederation can use a private AS number. A Huawei NE/AR router can be configured with up to 32 sub-AS numbers.
• B.The confederation divides an AS into several sub-ASs, and the external AS still considers the confederation to be an AS.
• C.The sub-AS number of the confederation is advertised to BGP peers outside the confederation by default.
• D.The confederation can easily detect the routing loop in the AS because EBGP is running between sub-ASs.

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When deploying LLQ, you need to configure bandwidth parameters. What is the meaning of bandwidth parameters?

• A.Provide a built-in policer to limit the maximum available bandwidth of low latency queues during congestion
• B.It indicates that the reference CR is used to calculate the burst size of the built-in tactical merging bucket.
• C.This parameter should be as small as possible. It means that the bandwidth is always reserved, even if LLQ is used, this parameter will reduce the available bandwidth of the interface.
• D.This parameter is an option because LLQ always takes precedence over other queues

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