As shown in the figure, two switches use the default parameters to run STP root primary, switch B uses the configuration command STP priority 0, which of the following ports will be blocked?

• A.G0/0/3 of HUB
• B.G0/0/2 of switch A
• C.G0/0/1 of switch A
• D.G0/0/1 of switch B

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At which layer of the OSI reference model does the router work?

• A.Network layer
• B.Application layer
• C.Transport layer
• D.Data Link Layer

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SNMP V1 defines 5 protocol operations.

• A.False
• B.True

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On Huawei routers, by default, the value of the internal routing priority of the OSPF protocol is?

• A.30
• B.10
• C.20
• D.1

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Which of the following statements about Hybrid ports is correct?

• A.The Hybrid port can strip the tags of certain vlan frames in the direction of the outgoing port
• B.When the Hybrid port sends a data frame, it must carry the vlan tag
• C.Hybrid ports only receive data frames with vlan tag
• D.Hybrid port does not require PVID

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