You have been asked to use a 28 bit subnet mask to segment the following network block:
108.12.5.0. How many usable hosts per sub-net could you create?
Click on the arrows to vote for the correct answer
A. B. C. D.B
Network: 108.12.5.0/28 (Class A)
Broadcast: 108.12.5.15 -
HostMin: 108.12.5.1 -
HostMax: 108.12.5.14 -
Hosts/Net: 14 -
=
To calculate the number of usable hosts per sub-net with a 28-bit subnet mask, we first need to understand how subnetting works.
Subnetting is the process of dividing a large network into smaller sub-networks (or subnets) for better management, security, and efficiency. A subnet mask is used to identify the network and host portions of an IP address.
A subnet mask consists of a series of 1s followed by a series of 0s. The number of 1s in the subnet mask determines the size of the network portion and the number of 0s determines the size of the host portion. In a 28-bit subnet mask, the first 28 bits are set to 1, and the remaining 4 bits are set to 0.
To calculate the number of usable hosts per sub-net, we need to subtract 2 from the total number of hosts in the subnet. The first and last IP addresses in each subnet are reserved for the network address and broadcast address, respectively, and cannot be assigned to hosts.
To calculate the number of subnets and hosts per subnet, we need to use the following formula:
Number of subnets = 2^(number of bits borrowed from host portion) Number of hosts per subnet = 2^(number of bits remaining in host portion) - 2
In this case, we are using a 28-bit subnet mask, which means we are borrowing 4 bits from the host portion.
Number of subnets = 2^4 = 16
Number of hosts per subnet = 2^4 - 2 = 14
Therefore, the answer is B. 14 hosts. With a 28-bit subnet mask, we can create 16 subnets, each with 14 usable hosts.