640-802 Cisco Certified Network Associate
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Note 2: 640-802 Answers are not shown in demo questions.
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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 1.
Your ISP assigned you a full class B address space. From this, you need at least 300 sub-networks that can support at least 50 hosts each. Which of the subnet masks below are capable of satisfying your needs? (Select two).
A. 255.255.255.0
B. 255.255.255.128
C. 255.255.252.0
D. 255.255.255.224
E. 255.255.255.192
F. 255.255.248.0
Display Answer
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Answer: B, E
Explanation: Requirement in the question is that the company needs 300 subnets and 50 hosts per
subnet.
Number of Bits in the Host or Maximum number of Hosts or
Subnet Field Subnets (2n-2)
1 0
2 2
3 6
4 14
5 30
6 62
7 126
8 254
9 510
10 1022
11 2046
12 4094
13 8190
14 16,382
With 9 bits used for the subnet portion, we get 510 subnets and using the remaining 7 bits
for the hosts gives us 126 hosts per subnet. The subnet mask will be 255.255.255.128
With 10 bits used for the subnet portion, we get 1022 subnets and then using the
remaining 6 bits for hosts provides 62 hosts per subnet. The subnet mask will be
255.255.255.192 in this case which will also fulfill the requirement.
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