Which of the following statements is wrong about VPN?

• A.Virtual private network ischeaper than dedicated line
• B.VPN technology is a technology that multiplexes logica channels on actual physical lines.
• C.VPN technology necessarily involves encryption technology
• D.The generation of VPN technology enables employees on business trips toremotely access internal corporate servers.

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Which of the following is true about the description of the TCP/IP protocol stack packet decapsulation? (Multiple choice)

• A.After the application layer receives the data packet, the application layer information is stripped after parsing, and the user data displayed at the end is exactly the same as the data sent by the sender host.
• B.After the transport layer (TCP) receives the data packet, the transport layer information is stripped after parsing, and the upper layer processing protocol, such as UDP, is known according to the parsing information.
• C.The data packet is first transmitted to the data link layer. After parsing, the data link layer information is stripped, and the network layer information is known according to the parsing information, such as IP.
• D.After receiving the data packet, the network layer is stripped after parsing, and the upper layer processing protocol is known according to the parsing information, such as HTTP.

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Which of the following operations are necessary during theadministrator upgrade of the USG firewall software version? (Multiple Choice)

• A.Restart the device
• B.Specify the next time you start loading the software version.
• C.Device factory reset
• D.Upload the firewall version software

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Regarding the problem that the two-way binding user of the authentication-free method cannot access the network resources, which of the following options are possible reasons? (Multiple choice)

• A.The authentication-free user does not use the PC with the specified IP/MAC address.
• B.Online users have reached a large value
• C.The authentication action in the authentication policy is set to "No credit / free authentication"
• D.The authentication-free user and the authenticated user are in the same security zone.

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Which of the following belongs to multi-channel protocol?

• A.FTP
• B.Telnet
• C.HTTP
• D.SMTP

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