640-802 Cisco Certified Network Associate Practice Exam

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640-802 Cisco Certified Network Associate

Note 1: 640-802 Exhibit and all related diagrams are not shown in demo questions.
Note 2: 640-802 Answers are not shown in demo questions.
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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.