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單項選擇題

A receiving host computes the checksum on a frame and determines that the frame is damaged.The frame is then discarded.At which OSI layer did this happen?（）

A. session
B. network
C. Physical
D. data link
E. Transport

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單項選擇題

A network administrator is verifying the configuration of a newly installed host by establishing an FTP connection to a remote server. What is the highest layer of the protocol stack that the nework administrator is using for this operation?（）

A. application
B. presentation
C. session
D. transport
E. internet
F. data link

單項選擇題

Refer to the exhibit, Host A pings interface S0/0 on router 3, what is the TTL value for that ping?（）

A. 253
B. 252
C. 255
D. 254

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