Which of the following statements regarding OSPF route summarization is false?

• A.OSPF supports two route summarization modes: ABR summarization and ASBR summarization.
• B.Route summarization can reduce routing information, decrease the routing table size, and improve router performance.
• C.Any router in OSPF can summarize routes.
• D.Route summarization is the process of summarizing routes with the same prefix into one route and then advertising only the summarized route to other areas.

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Which of the following statements regarding DR/BDR are false?

• A.All DR others establish neighbor relationships with DR and BDR only.
• B.DR others listen on the multicast address 224.0.0.5.
• C.In a broadcast network, DR and BDR must be elected. A broadcast network without a DR or BDR cannot operate normally.
• D.DR others listen on the network address 224.0.0.6.

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Which Of the following IEEE 802.11 standards is also known as Wi-Fi 6?

• A.802.11n
• B.802.11b
• C.802.11ac
• D.802.11ax

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A monitoring plane usually comprises the monitoring units of main control boards and interface boards. This plane can monitor the system environment independently. Which of the following environment monitoring functions can be provided by the monitoring plane?

• A.Voltage monitoring
• B.Fan control
• C.Temperature monitoring
• D.System power-on and power-off control

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ON a stateful inspection Firewall where there is no session table, when the status detection mechanism is enabled and the second packet (CYN+ACK) of 3-way hadshakes reaches the firewall. Which of the following statements is true?

• A.By default, when status detection is disabled and the permit policy is configured packets can pass.
• B.If the firewall security policy permits packets to pass, the packets can pass the firewall.
• C.If the firewall security policy permits packets to pass, the session table is created.
• D.Packets must pass the firewall, and a session table is established.

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