One of the features of OSPF is that it only supports MD5 authentication.

• A.False
• B.True

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Which of the following about OSPF AS-External-LSA is correct? (Multiple choice)

• A.Link State ID is set as the destination network segment address
• B.Net mask is set to all 0
• C.Use Link State ID and Advertising Router to uniquely identify an AS-External-LSA
• D.Advertising Router is set to ASBR Router ID

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Regarding the accompanying business, which of the following statements is correct? (Multiple choice)

• A.The administrator can execute the business strategy on the device in the controller system-manage the entire network strategy
• B.In the free mobility solution, the administrator does not need to repeat the configuration for each device
• C.The administrator does not need to care about the user's IP address when configuring the policy
• D.The controller is not only the certification center in the campus network, but also the management center of business strategies

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The first 4 bits of the IP multicast address are fixed 1110, corresponding to the high 25 bits of the multicast MAC address. Among the last 28 bits of the IP multicast address, only 23it is mapped to the MAC address, so 5 bits of address information are lost. The direct result is that 32 IP multicast addresses are mapped to the same MAC address.

• A.FALSE
• B.TRUE

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In a stateful inspection firewall, when the stateful inspection mechanism is turned on, when the second packet (SHN+ACK) of the three-way handshake arrives at the firewall, if there is no corresponding session table on the firewall, which of the following statements is correct?

• A.The message must pass through the firewall and establish a session table
• B.If the firewall security policy allows packets to pass, the packets can pass through the firewall
• C.By default, after the status function is turned off, and the permission policy is configured, you can pass
• D.If the firewall security policy allows packets to pass, create a session table

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