What port numbers may be used by FTP protocol? (Choose two.)

• A.80
• B.20
• C.21
• D.23

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Which of the following is the correct descriptionof the investigation and evidence collection?

• A.Evidence obtained by eavesdropping is also valid
• B.Document evidence is required in computer crime
• C.Evidence is not necessarily required during the investigation
• D.In the process of all investigation and evidence collection, there are law enforcement agencies involved.

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About the description of firewall active-standby, which of the following is correct?(Multiple Choice)

• A.It requires the state of all the VRRP backup groups in the same VGMP management group on the same firewall should be consistent.
• B.When a plurality of regions on the firewall needs to provide dual-machine backup function, you need to configure multiple VRRP backup groups on the firewall.
• C.VGMP is to ensureall VRRP backup groups' consistency of switching
• D.The firewall active-standby requires the information such as the session table. MAC table, routing table and so on synchronous backup between primary devices and slave devices.

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Which of the following statement about the NAT configuration is wrong?

• A.The firewall does not support NAPT conversion for ESP and AH packets.
• B.The IP address in the address pool can overlap with the public IP address of the NAT server
• C.Configure source NAT in -.transparent mode, the firewall does not support easy-ip mode
• D.When there is VoIP service in the network, you do not need to configure NAT ALG

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Which of the following belongs to multi-channel protocol?

• A.FTP
• B.SMTP
• C.HTTP
• D.Telnet

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