If the administrator finds that the file cannot be transferred to the Huawei AR2200 through TFTP, what is the possible cause? ()

• A.TCP port 69 of the TFTP server is disabled
• B.TFTP service is disabled on the router
• C.The username and password on the TFTP server are modified.
• D.UDP port 69 of the TFTP server is disabled

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ATM features include

• A.Connection-oriented
• B.fast packet switching
• C.Statistical Multiplexing
• D.Support for multi-rate, multi-service
• E.provide complete real-time QoS guarantee business
• F.supports voice, data and image

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Which of the following protocol is used to transfer e-mail on the Internet?

• A.FTP
• B.TFTP
• C.MSTP
• D.SMTP

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The administrator finds that the two routers stay in the TWO-WAY state when establishing an OSPF neighbor.
The correct description is ().

• A.The router is configured with the wrong router ID
• B.These two routers are DR Other routers in the broadcast network.
• C.The router is configured with the same zone ID
• D.The router is configured with the same process ID.

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Referring to the following topology and configuration, routers R1 and R2 are connected through a Serial low-speed cable, and the data link layer uses PPP. When R1 and R2 When the Holdtimes are inconsistent, ARP negotiation fails and communication cannot be performed.

• A.Error
• B.Correct

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