Under normal circumstances, the Emai1 protocols we often talk about include ____, POP3, and SMTP.[fill in the blank]*

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existVRRP(Virtual Router Redundancy Protocol) group, the primary firewall regularly sends notification messages to the backup firewall, and the backup firewall is only responsible for monitoring notification messages and will not respond

• A.True
• B.False

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The attacker sendsICMPAnswer the request and set the destination address of the request packet as the broadcast address of the victim network. What kind of attack is this behavior?

• A.SYN floodattack
• B.IPspoofing attack
• C.Smurfattack
• D.ICMPredirect attack

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Regarding the description of IP Spoofing, which of the following is wrong?

• A.IP spoofing attacks are launched by using the normal IP address-based trust relationship between hosts
• B.Hosts in a trust relationship based on IP addresses can log in directly without entering password verification
• C.After an IP spoofing attack is successful, the attacker can use any forged IP address to imitate a legitimate host to access key information
• D.The attacker needs to disguise the source IP address as a trusted host and send a data segment marked with SYN to request a connection

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Which of the following are not common application scenarios of digital certificates?

• A.FTP
• B.IPSEC VPN
• C.HTTPS
• D.SSL VPN

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