Both A and B communicate data. If an asymmetric encryption algorithm is used for encryption, when A sends data to B, which of the following keys will be used for data encryption?

• A.A public key
• B.A private key
• C.B public key
• D.B private key

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When the firewall hard disk is in place, which of the following is correct description for the firewall log?

• A.The administrator knows the user's behavior, the keywords explored, and the effectiveness of the audit policy configuration through the user activity log.
• B.The administrator can use the threat logto understand the user's security risk behavior and the reason for being alarmed or blocked.
• C.The administrator can advertise the content log to view the detection and defense records of network threats.
• D.The administrator can learn the security policy of the traffic hit through the policy hit log. And use it for fault location when the problem occurs.

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Which of the following is true about the sequencing of the PKI work process?
1. The communication terminal applies for CA certificate.
2. PKI replies to CA certificate
3. Obtain each other's certificate and verify the validity
4. Communication terminal installs local certificate
5. PKI issues a local certificate
6. The communication terminal applies for a local certificate
7. Communication terminal installs CA certificate
8. Communicate with each other

• A.6-5-4-3-1-2-7-8
• B.6-5-4-1-2-7-3-8
• C.1-2-7-6-5-4-3-8
• D.1-2-6-5-7-4-3-8

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Ininformation security prevention, commonly used security products are firewalls, Anti-DDos devices and IPS/IDS devices.

• A.True
• B.False

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Which of the following statement about the NAT is wrong?

• A.NAT technology can effectively hide the costs of the LAN; it is an effective network security protection technology
• B.Address Translation can follow the needs of users, providing FTP, WWW, Telnet and other services outside the LAN
• C.Some application layer protocols carry IP address information in the data, but also modify the IP address information in the data of the upper layer when they are as NAT
• D.For some non-TCP, UDP protocols (such as ICMP, PPTP), unable to do the NAT translation

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