A customer wants to separate the finance department from the marketing department. The network administrator suggests segmenting the existing Class C network into two sections and readdressing all devices appropriately. Which of the following subnet masks should the network administrator use?

Rationale

/25 subnet mask allows for two equal segments of a Class C network.

Using a /25 subnet mask divides a Class C network into two subnets, each containing 126 usable IP addresses. This effectively separates the finance and marketing departments while maximizing address space for future growth.

A (/24) YOUR ANSWER

A /24 subnet mask provides a single subnet with 256 total addresses (254 usable), which does not serve the purpose of segmentation as it keeps all devices within the same network. Therefore, it does not satisfy the requirement to separate the finance and marketing departments.

B (/25) CORRECT

With a /25 subnet mask, the Class C network is split into two subnets, each with 128 total addresses (126 usable). This option allows the network administrator to effectively segregate the finance and marketing departments while maintaining sufficient IP addresses for each department, fulfilling the customer's request.

C (/26) YOUR ANSWER

A /26 subnet mask divides the Class C network into four subnets, each containing 64 total addresses (62 usable). While this does provide segmentation, it offers fewer usable addresses per subnet than the /25 option, which may not be adequate for the needs of either department.

D (/27) YOUR ANSWER

Using a /27 subnet mask results in eight subnets, each with 32 total addresses (30 usable). This further reduces the number of available addresses per subnet, making it impractical for departments that may require more IP addresses for devices, thus failing to meet the segmentation requirement effectively.

Conclusion

To successfully segment a Class C network for the finance and marketing departments, a /25 subnet mask is the optimal choice. It allows for two distinct subnets, each providing a sufficient number of usable IP addresses, ensuring both departments can operate independently while accommodating future growth. The other choices either fail to provide adequate segmentation or limit usable addresses too severely.

A customer wants to separate the finance department from the marketing department. The network administrator suggests segmenting the existing Class C network into two sections and readdressing all devices appropriately. Which of the following subnet masks should the network administrator use?

/25 subnet mask allows for two equal segments of a Class C network.

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