CompTIA Tech+ (FC0-U71)IT Concepts and TerminologyEasy
A technician is setting up a new server and needs to assign it a static IP address. The network uses a subnet mask of 255.255.255.0. Which of the following IP addresses is a valid host address within the 192.168.1.0/24 network?
- A192.168.2.1
- B192.168.1.255
- C192.168.1.0
- D192.168.1.25
Show answer & explanationAnswer & explanation
Correct answer: D. 192.168.1.25
In a /24 network (subnet mask 255.255.255.0), the first three octets identify the network, and the last octet identifies the host. The network address (all zeros in the host portion) and the broadcast address (all ones in the host portion) are reserved. Therefore, 192.168.1.25 is a valid host address.
Why the other options are wrong
- A. This IP address belongs to a different network (192.168.2.0/24), not the 192.168.1.0/24 network.
- B. This is the broadcast address for the 192.168.1.0/24 network, which cannot be assigned to a host.
- C. This is the network address, which cannot be assigned to a host.
Valid Host IP Address
An IP address that can be assigned to a device on a network, excluding the network address and broadcast address.
- Network address: all host bits are 0.
- Broadcast address: all host bits are 1.
- Host addresses fall between the network and broadcast addresses.
Memory trick: Network's house: first is zero, last is all. Live in between!