640-802 Cisco Certified Network Associate
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Note 2: 640-802 Answers are not shown in demo questions.
Exhibits and Answers are only provided in the Full Version.
Demo Question 7.
Given that you have a class B IP address network range, which of the subnet masks below will allow for 100 subnets with 500 usable host addresses per subnet?
A. 255.255.0.0
B. 255.255.224.0
C. 255.255.254.0
D. 255.255.255.0
E. 255.255.255.224
Display Answer
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Answer: C
Explanation: Using the 2n-2 formula for host addresses, 29-2 = 510 host address, so a 9-bit subnet
mask will provide the required number of host addresses. If these 9 bits are used for the
hosts in a class B network, then the remaining 7 bits are used for the number of networks.
Again using the 2n-2 formula, we have 2n-2 = 126 networks that are available.
Incorrect
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