Which of the following descriptions about firewalls is wrong?

• A.Firewall can realize access control between different networks
• B.The firewall cannot achieve network address translation
• C.Firewall can isolate networks with different security levels
• D.Firewall can realize user identity authentication

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The router Radius information configuration is shown in the figure. Which of the following statement is correct? (Multiple Choice)

• A.The IP address of the accounting server is 200.0.12.1
• B.The IP address of the authorization server is 200.0.12.1
• C.The source IP source address of the Radius packet sent by the router is 200.0.12.2
• D.The IP address of the authentication server is 200.0.12.1

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In the network as shown in the figure below, the host has an ARP cache. Which of the following statements is correct? (Multiple Choice)

• A.Host A and Host B can communicate in both directions
• B.The following entries may exist in the ARP cache of host A, 10.0.12.2 MAC-C
• C.The router needs to be configured with static routing, otherwise host A and host B cannot communicate in both directions
• D.The following entries exist in the ARP cache of host A 11.0.12.1 MAC-B

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Which type of message is used by network devices running SNMPv 1 protocol to actively send alarm information?

• A.Get-Next Request
• B.Trap
• C.Response
• D.Get Request

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The role of the collaboration layer in the SDN architecture is to complete job deployment based on user intentions. OpenStack belongs to the business collaboration layer.

• A.TURE
• B.FALSE

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