In the SSL handshake protocol, which of the following message is optional? (Choose two.)

• A.Server Key Exchange
• B.ChangeCipherSpec
• C.Certificate verify
• D.ServerHelloDone

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About the default security zones of USG series security firewall, which of the following statement is correct?

• A.The security level of the default security zone can be modified
• B.There are four default security zones
• C.The default security zone can be deleted
• D.The default security zone cannot be deleted, but can modify the security level

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Which of the following descriptions is wrong about IKE SA?

• A.The encryption algorithm used by user data packets is determined by IKE SA.
• B.IKE is a UDP-based application layer protocol
• C.IKE SA is two-way
• D.IKE SA for IPSec SA services

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Encryption technology can transform readable information into unreadable information in a certain way

• A.True
• B.False

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Which of the following are remote authentication methods? (Multiple choice)

• A.LLDP
• B.Local
• C.HWTACACS
• D.RADIUS

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