The Layer 2 switch is a data link layer device, which can identify the MAC address information in the data frame, forward data according to the MAC address, and record these MAC addresses and corresponding port information in its own MAC address table.

• A.False
• B.True

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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 matching method of the flow table is to match the MAC address and IP address of the traffic at the same time
• B.The routing table is of fixed length. A device can only have one public routing table
• C.The flow table is variable length. A network device can only have one flow table
• 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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As shown in the figure below, host A and host B cannot communicate.

• A.True
• B.False

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Which of the following description about DD packets and LSA of OSPF is correct? (Multiple choice)

• A.DD packet contains detailed information about LSA
• B.LSA header is only a small part of LSA
• C.The header of an LSA can uniquely identify an LSA
• D.The DD packet contains only LSA header information

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On the broadcast network, both DR and BDR use the multicast address 224.0.0.6 to receive link state update messages.

• A.True
• B.False

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