The configuration information of a certain port of the switch is shown in the figure. Which of the following statements is wrong?

• A.If the VLAN TAG carried in the data frame is 200, the switch strips off the VLAN TAG
• B.If the VLAN TAG carried in the data frame is 100, the switch will strip off the VLAN TAG and send it out
• C.If the port receives a data frame without VLAN TAG, the switch needs to add VLAN TAG 100
• D.The port type is Hybrid

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The classic network forwarding method is based on router routing table forwarding. The forwarding method of OpenFlow switches is based on flow table forwarding. Which of these two forwarding methods are correct? (Multiple Choice)

• A.The routing table is of fixed length. A device can only have one public routing table
• B.The flow table is variable length. A network device can only have one flow table
• C.The matching method of the flow table is to match the MAC address and IP address of the traffic at the same time
• D.The matching method of the address table is to match the route of the destination network segment with the longest mask

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In the OSPF protocol, which of the following descriptions of DR is correct? (Multiple choice)

• A.If the priority values of the two routers are equal, the router with the larger Router ID is selected as the DR
• B.DR and BDR should also establish an adjacency relationship
• C.By default, all routers in this broadcast network will participate in the DR election
• D.If the priority values of the two routers are different, select the router with the lower priority as the DR

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The IEEE 802.11ac standard only supports the 5GHz frequency band.

• A.TRUE
• B.FALSE

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Which field of the ipv6 packet header can be used for QoS?

• A.Payload Length
• B.Traffic Class
• C.Next Header
• D.Version

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