Q
"Which of the following subnet masks are represented with the CIDR of / 27?
A. 255.255.255.254
B. 255.255.255.248
C. 255.255.255.224
D. 255.255.255.240"
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Answer
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Step 1:: Understand the problem and recognize that we need to find the subnet mask represented with the CIDR of / 27.
A subnet mask is a number that defines a range of IP addresses that can be used in a network. The CIDR notation (Classless Inter-Domain Routing) is a way to represent the subnet mask using a dot-decimal notation followed by a slash and the number of leading 1 -bits (n) in the subnet mask (e.g., / 27). To find the subnet mask, we need to convert the given CIDR notation to a dotted-decimal format.
Step 2:: Convert the CIDR notation (/ 27) to a binary format.
In the CIDR notation / 27, the number 27 indicates the number of leading 1 -bits in the subnet mask. To convert this to a binary format, we write 27 consecutive 1s followed by the remaining 25 bits as 0s: 11111111 11111111 11111111 11100000
Step 3:: Convert the binary format to a dotted-decimal format.
Now, we convert the binary subnet mask to a dotted-decimal format by dividing it into four octets (each containing 8 bits) and converting each octet separately. First octet: 11111111 = 255 Second octet: 11111111 = 255 Third octet: 11111111 = 255 Fourth octet: 11100000 = 248 + 128 = 255 + 128 - 16 = 240 + 128 - 16 = 256 - 16 = 240 So, the subnet mask represented with the CIDR of / 27 is:
Step 4:255.255.240
Step 5:: Identify the correct answer.
Comparing the result from Step 3 with the given options, we find that: A. 255.255.255.254 is not the correct answer. B. 255.255.255.240 is the correct answer. C. 255.255.255.224 is not the correct answer. D. 255.255.255.248 is not the correct answer.
Final Answer
The subnet mask represented with the CIDR of / 27 is 255.255.255.240.
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