Which subnet mask is valid?

Posted by: Pdfprep Category: 98-366 Tags: , , Post Date: November 23, 2020

Which subnet mask is valid?
A . 255.255.255.240
B . 255.255.255.228
C . 255.255.255.164
D . 255.255.255.245

Answer: A

Explanation:

These are valid:

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