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Question 105 - SK0-005 discussion

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A server administrator needs to configure a server on a network that will have no more than 30 available IP addresses. Which of the following subnet addresses will be the MOST efficient for this network?

A.
255.255.255.0
Answers
A.
255.255.255.0
B.
255.255.255.128
Answers
B.
255.255.255.128
C.
255.255.255.224
Answers
C.
255.255.255.224
D.
255.255.255.252
Answers
D.
255.255.255.252
Suggested answer: C

Explanation:

The most efficient subnet address for a network that will have no more than 30 available IP addresses is 255.255.255.224. This subnet mask corresponds to a /27 prefix length, which means that 27 bits are used for the network portion and 5 bits are used for the host portion of an IP address. With 5 bits for hosts, there are 2^5 - 2 = 30 possible host addresses per subnet, which meets the requirement. The other options are either too large or too small for the network size. Reference:

https://www.ibm.com/cloud/learn/subnet-mask

asked 02/10/2024
Matteo Di Pomponio
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