单项选择题

An administrator attempts to open a web page and sees the following error: 'Error 404: Page not found'. The administrator then uses the ping command and finds that the default gateway cannot be pinged.
At which of the following layers does the problem MOST likely reside?（）

A.Layer 1
B.Layer 4
C.Layer 5
D.Layer 7

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An administrator attempts to open a web page and sees the following error: 'Error 404: Page not found'. The administrator then uses the ping command and finds that the default gateway cannot be pinged. At which of the following layers does the problem MOST likely reside?（）

An administrator attempts to open a web page and sees the following error: 'Error 404: Page not found'. The administrator then uses the ping command and finds that the default gateway cannot be pinged.
At which of the following layers does the problem MOST likely reside?（）