The MAC address table of existing switches is shown in the figure. Which of the following statements are correct? () (Single-choice question)

• A.When the switch restarts, the MAC address learned by port Eth0/0/2 does not need to be relearned
• B.Received a data frame with a source MAC address of 5489-9811-0b49 and a destination MAC address of 5489-989d1d30 from the port. Forwarded from the Eth0/0/2 port
• C.When the switch restarts, the MAC address learned by port Eth0/0/2 does not need to be relearned
• D.The data frame with the source MAC address of 5489-9885-18a8 and the destination MAC address of 5489-989d-1d30 is received from the port. It is forwarded from the Eth0/0/1 port

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The network shown in the figure below. All links are Ethernet links, and all interfaces of all routers run OSPF protocol, how many DRs are elected in the entire network? () (Single-choice question)

• A.3
• B.1
• C.4
• D.2

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SNMPv1 defines five protocol operations. ()

• A.True
• B.False

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As shown in the figure, the G0/0/0 and G0/0/1 interfaces of RTA are connected to two different network segments. RTA is the gateway of these two networks. Before host A sends data to host C, will it send an ARP Request to obtain O's MAC address? () (Single-choice question)

• A.G0/0/1 interface of RTA
• B.G0/0/0 interface of RTA
• C.SW
• D.Host C

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The following description of the Forwarding status in the spanning tree protocol is wrong (). ()*

• A.Ports in the Forwarding state can forward data packets
• B.The port in the Forwarding state does not learn the source MAC address of the packet.
• C.Ports in the Forwarding state can receive BPDU packets
• D.Ports in the Forwarding state must send BPDU message

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