what is the first usable ip address in the 192.168.1.128/25 network?
The correct answer and explanation is:
In the 192.168.1.128/25 network, the first usable IP address is 192.168.1.129.
Explanation:
The given network has a /25 subnet mask, which means that the first 25 bits of the IP address represent the network part, and the remaining 7 bits are used for host addresses. In this case, the subnet mask is 255.255.255.128, which corresponds to 11111111.11111111.11111111.10000000 in binary.
Step-by-Step Breakdown:
- Determine the Network Address:
- The network address is 192.168.1.128, and it is the first address in the range. This address cannot be assigned to any host, as it represents the network itself.
- This is derived by performing a logical AND operation between the IP address 192.168.1.128 and the subnet mask 255.255.255.128.
- Identify the Broadcast Address:
- The broadcast address for the subnet is 192.168.1.255, which is the last address in the range. This address is used to communicate with all hosts in the network and cannot be assigned to any individual device.
- Calculate the Usable Range:
- The usable IP addresses are all the addresses between the network address and the broadcast address, excluding these two.
- For the 192.168.1.128/25 network, the usable IP address range is from 192.168.1.129 to 192.168.1.254.
- First Usable IP Address:
- The first usable IP address is 192.168.1.129, which can be assigned to the first host on the network.
In summary, in the 192.168.1.128/25 network, the first usable IP address is 192.168.1.129, and it can be assigned to the first host in that subnet.