Which of the following is the correct about computer virus?

• A.All computer viruses must be parasitic in files and cannot exist independently
• B.The computer virus is latent. It may be lurking for a long time. It will only begin to perform sabotage if certain conditions are met.
• C.The computer virus is contagious. It can spread through floppy disks and optical disks but it does not spread through the network.
• D.Patching the system can completely solve the problem of virus intrusion

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Huawei WAF products are mainly composed of front-end execution, back-end central systems and databases.
Among them, the database mainly stores the front-end detection rules and black Whitelist and other configuration files.

• A.True
• B.False

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Which of the following is a false positive for an intrusion detection system?

• A.Use Ping for network detection and being alerted as an attack
• B.The process of trying to log in to the system was recorded
• C.Web-based attacks have not been detected by the system
• D.Unable to detect new worms

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Huawei NIP6000 products provide carrier-class high-reliability mechanisms from multiple levels to ensure the stable operation of equipment.
Which of the following options belong to the network reliability? (multiple choice)

• A.Power supply. 1+1 redundant backup
• B.Hardware Bypass
• C.Link-group
• D.Dual machine hot backup

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For SYN flood attacks, TCP source authentication and TCP proxy can be used for defense.
Which of the following description is correct?

• A.After the TCP source authentication passes the source authentication of the client, it is added to the whitelist. Then the SYN packet of this source still needs to be verified.
• B.TCP source authentication has the same restriction on the path of packets, so the application is not as common as TCP proxy.
• C.TCP proxy means that the firewall is deployed between the client and the server. When the client sends an SYII packet to the server through the firewall, the firewall instead of the server establishes a three-way handshake with the client. Generally used for scenarios where the path of the packet is inconsistent.
• D.During the TCP proxy process, the firewall proxies and responds to every SYN packet received and maintains half-connection. Therefore, when the traffic of the SYN packet is heavy, the firewall requires very high performance.

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