ICND1 2.0: Understanding IPv4 Addresses

This course is included in our On-demand training solution.


There are various aspects to IP addressing, including calculations for constructing an IP address, classes of IP addresses designated for specific routing purposes, and public versus private IP addresses. There are also two types of IP addresses: IPv4 and IPv6. This course introduces the concepts behind IPv4 addresses. Subnetworks, or subnets, are very common in all but the smallest network environments, segmenting networks into smaller divisions that have their own addresses. To create subnet addresses, some of the bits that are used for the host portion of an IP address are “borrowed” to create the subnet address. This course concludes with describing how subnets function and how they are computed.

Target Audience

Interconnecting Cisco Network Devices Part 1 is essential for students preparing for the CCNA Routing and Switching or CCENT certifications. Students pursuing the CCNA Routing and Switching certification should complete parts 1 & 2 of the ICND learning path. Students pursuing the CCENT certification need only attend part 1 of the ICND curriculum. Anyone wishing to obtain Cisco Certified Network Associate (CCNA) 100-101 certification that validates the knowledge and skills required to successfully install, operate, and troubleshoot small to medium size enterprise branch network. Network administrators, network engineers, network managers, network designers, and project managers. Familiarity of navigating PC operating systems, the Internet, and basic IP addressing knowledge skills recommended.


Expected Duration

120 min.

Course Objectives


  • identify the characteristics of IP
  • identify the components of an IPv4 header
  • Decimal and Binary Systems

  • recognize how network devices use binary systems to define their location on the network
  • IP Address Classes

  • match reserved IPv4 address to its description
  • Verifying the IP Address of a Host

  • verify the host IP address
  • The Subnet Mask

  • identify the purpose of a subnet mask
  • Classful Masks and Borrowed Bits

  • match the subnet masks with their correct class
  • Calculating Subnets

  • calculate how many subnets are created in a given scenario
  • Hosts per Subnet

  • describe how to create subnet addresses
  • Subnetting Practice

  • create a subnetting chart cheat sheet