When the user single sign-on is configured, the receiving PC message mode is adopted. The authentication process has the following steps: 1 The visitor PC executes the login script and sends the user login information to the AD monitor. 2 The firewall extracts the correspondence between the user and the IP from the login information. Add to the online user table 3 AD monitor connects to the AD server to query the login user information, and forwards the queried user information to the firewall. 4 The visitor logs in to the AD domain. The AD server returns the login success message to the user and delivers the login script. which of the following order is correct?

• A.1-2-3-4
• B.4-1-3-2
• C.3-2-1-4
• D.1-4-3-2

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The Protocol field in the IP header identifies the protocol used by the upper layer.
Which of the following field values indicates that the upper layer protocol is UDP protocol?

• A.18
• B.6
• C.11
• D.17

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Digital certificates are fair to public keys through third-party agencies, thereby ensuring the non-repudiation of data transmission. Therefore, to confirm the correctness of the public key, only the certificate of the communicating party is needed.

• A.True
• B.False

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Security technology has different methods at different technical levels and areas. Which of the following devices can be used for network layer security protection? (Multiple choice)

• A.Vulnerability scanning device
• B.Firewall
• C.IPS/IDS device
• D.Anti-DDoS device

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The host firewall is mainly used to protect the host from attacks and intrusions from the network

• A.True
• B.False

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