A network administrator fails to access devices on the internal network through Telnet. Which of the following causes is the most impossible?

• A.The route is unreachable, and the client fails to establish a TCP connection with the server.
• B.The protocol inbound all command is configured in the VTY user interface view.
• C.The number of login users reaches the upper limit.
• D.An ACL is bound in the VTY user interface view.

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Currently, to which of the following modes does network design conform?

• A.Modular
• B.Modern
• C.Standard
• D.Automatic
• E.Hierarchical

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Which of the following statements regarding the software and configuration backup is true?

• A.The software version needs to be backed up for multiple times for the same product and the same version.
• B.Backup is used to restore network functions in extreme cases.
• C.Licenses do not need to be backed up.
• D.After the device configuration changes, the configuration file does not need to be backed up.

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• A.The destination network described by this LSA is 10.0.23.0/24
• B.This device is AER
• C.The LSA in Figure is generated by Xinyi
• D.The type of the LSA is AS-tenaL-L84

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On a Layer 2 switching network devices forward data based on MAC addresses. Therefore, data filtering can be performed based on MAC addresses, and a firewall in transparent cannot filter out Layer 3 information in data packets.

• A.FALSE
• B.TRUE

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