When using FTP for file transfer, how many TCP connections will be established?

• A.2
• B.3
• C.4
• D.1

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Which statement about the function of the network layer in the OSI reference model is correct?

• A.The layer closest to the user in the OSI reference model, which provides network services for applications
• B.Provide connection-oriented or non-connection-oriented data transfer and error detection before retransmission
• C.Provide a logical address to forward data from source to destination
• D.Combine bits into bytes, then combine bytes into frames, use link layer addresses (Ethernet uses MAC addresses) to access media, and perform error detection
• E.Transmits a bitstream between devices, specifying levels, speeds, and cable pinouts

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After successfully logging in to the router through Telnet, the administrator finds that the interface IP address of the router cannot be configured. So what are the possible reasons?

• A.The Telnet terminal software used by the administrator prohibits corresponding operations
• B.The authentication mode of the Telnet user is wrongly configured.
• C.Telnet user level configuration error
• D.SNMMP parameter configuration error

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What is the default server port number used by the Telnet protocol?

• A.24
• B.23
• C.22
• D.21

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The Radius information configuration of the router is as follows, which of the following statements is correct? (Multiple choice) radius-server template Huawei radius-server shared-key cipher Huawei radius-server authentication 200.0.12.1 1812 radius-server accounting 200.0.12.1 1813 radius-attribute nas-ip 200.0.12.2
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• A.The IP address of the billing server is 200.0.12.1
• B.The IP address of the authorization server is 200.0.12.1
• C.The IP address of the authentication server is 200.0.12.1
• D.The source IP address of the router sending the Radius packet is 200.0.12.2

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