單項選擇題

Which of the following layers is associated with the physical hardware address of a network node?（）

A.Layer 1
B.Layer 2
C.Layer 6
D.Layer 7

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單項選擇題

Which of the following OSI model layers is used for logical addressing?（）

A. Physical
B. Transport
C. Network
D. Data link

單項選擇題

Which of the following is the MOST efficient way to troubleshoot network problems?（）

A. Create an action plan
B. Implement and test a solution
C. Determine if anything has changed
D. Identity a probable cause