IP addresses and subnetting basics
45 min · Intermediate
An IP address is the number that identifies a device on a network, like a postal address for packets. Subnetting questions turn up often in placement tests, and they need only one idea: the address splits into a network part and a host part.
Topics in this lesson
- IPv4 structure, classes and private ranges
- CIDR notation and subnet masks
- Worked subnetting: network, broadcast and host count
- IPv4 vs IPv6
- A method for subnetting questions in tests
Interview questions this lesson answers
- What is an IP address?
- What is an octet?
- What are the IPv4 classes?
- List the private IPv4 ranges.
- What is a subnet mask?
- What is the network address of a subnet?
- What is the broadcast address?
- What is the formula for usable hosts?
- How do you find the network address quickly?
- What is the difference between a public and a private IP address?
Sign in free to continue this lesson
Create a free account to read every lesson, practise with the exercises and keep track of your progress.