Which of the following description about the VGMP protocol is wrong?

• A.State of VGMP group is active, which will periodically send HELLO packets to the opposite end, Stdandby end only monitors the HELLO packets, which will not respond
• B.By default, when three HELLO packet cycle of Standby end does not receive HELLO packets which are sent from the opposite end, the opposite end will be considered a failure, which will switch itself to the Active state
• C.VGMP ensure that all VRRP backup groups state are the same through a unified control of the switching of each VRRP backup group state
• D.VGMP add multiple VRRP backup groups on the same firewall to a management group, uniformly manage all the VRRP group by management group.

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Which of the following descriptions are correct about the buffer overflow attack? (Multiple Choice)

• A.Buffer overflow attacks are the most common method of attacking software systems
• B.Buffer overflow attacks are not related to operating system vulnerabilities and architectures
• C.Buffer overflow attack belongs to application layer attack behavior
• D.Buffer overflow attack is the use of software system for memory operation defects, running attack code with high operation authority

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The process of electronic forensics includes: protecting the site, obtaining evidence, preserving evidence, identifying evidence, analyzing evidence, tracking and presenting evidence.

• A.False
• B.True

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The scene of internal users access the internet as shown, the subscriber line process are:
1. After authentication, USG allow the connection
2. The user input http://1.1.1.1 to access Internet
3. USG push authentication interface, User =? Password =?
4. The user successfully accessed http://1.1.1.1, equipment create Session table.
5. User input User = *** Password = ***
Which the following procedure is correct?

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

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Digital signatures are used to generate digital fingerprints by using a hashing algorithm to ensure the integrity of data transmission

• A.False
• B.True

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