How to Allocate Subnets for Finance, HR, and IT Departments - N10-007 Exam Answer

The corporate head office has assigned the subnet of 10.1.100.0/24 to a network technician.

The technician wants to create subnets for the finance department, human resources, and IT.

Given the following device counts: Finance: 70 devices - Human resources: 38 devices - IT: 16 devices - Which of the following outlines how the technician should allocate the address space given?

A.

Finance: 10.1.100.0/21 Human resources: 10.1.100.128/22 IT: 10.1.100.192/23

B.

Finance: 10.1.100.0/23 Human resources: 10.1.100.128/22 IT: 10.1.100.192/21

C.

Finance: 10.1.100.0/25 Human resources: 10.1.100.128/26 IT: 10.1.100.192/27

D.

Finance: 10.1.100.0/26 Human resources: 10.1.100.128/27 IT: 10.1.100.192/28

C.

To create subnets for the finance department, human resources, and IT with the given device counts, the network technician needs to allocate the IP address space in a way that provides enough IP addresses for each subnet.

The subnet 10.1.100.0/24 provides 256 IP addresses (from 10.1.100.0 to 10.1.100.255) which can be divided into smaller subnets for the three departments. The network technician needs to choose the appropriate subnet mask to provide enough IP addresses for each department while ensuring that the subnets do not overlap.

A subnet mask is a 32-bit value that is used to divide an IP address into network and host portions. In the CIDR notation, the subnet mask is represented by the number of bits that are set to 1 from left to right. For example, the subnet mask /24 (or 255.255.255.0 in decimal notation) means that the first 24 bits of an IP address are used for the network portion and the remaining 8 bits are used for the host portion.

To determine the appropriate subnet mask for each department, the network technician needs to calculate the number of required IP addresses for each department and choose a subnet mask that provides enough IP addresses while minimizing the wasted IP address space.

A. Finance: 10.1.100.0/21 Human resources: 10.1.100.128/22 IT: 10.1.100.192/23

In this option, the subnet mask for the finance department is /21, which provides 2048 IP addresses (from 10.1.96.0 to 10.1.103.255). This is more than enough for the 70 devices required by the finance department. However, the network technician has allocated a larger address space than necessary, which may result in wasted IP addresses.

The subnet mask for the human resources department is /22, which provides 1024 IP addresses (from 10.1.100.128 to 10.1.103.255). This is also more than enough for the 38 devices required by the human resources department. However, the network technician has allocated a larger address space than necessary, which may result in wasted IP addresses.

The subnet mask for the IT department is /23, which provides 512 IP addresses (from 10.1.100.192 to 10.1.101.255). This is enough for the 16 devices required by the IT department.

B. Finance: 10.1.100.0/23 Human resources: 10.1.100.128/22 IT: 10.1.100.192/21

In this option, the subnet mask for the finance department is /23, which provides 512 IP addresses (from 10.1.100.0 to 10.1.101.255). This is enough for the 70 devices required by the finance department.

The subnet mask for the human resources department is /22, which provides 1024 IP addresses (from 10.1.100.128 to 10.1.103.255). This is also more than enough for the 38 devices required by the human resources department.

The subnet mask for the IT department is /21, which provides 2048 IP addresses (from 10.1.96.0 to 10.1.103.255). This is more than enough for the 16 devices required by the IT department. However, the network technician has allocated a larger address space than necessary, which may result in wasted IP addresses.

C. Finance: 10.1.100.0/25 Human resources: 10.1.100.