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CCNA Networking · Quick Reference

Module 11 — IPv4 Addressing Cheat Sheet

CCNA Networking
In one line: An IPv4 address is a 32-bit binary value used to uniquely identify a device on a network. To make it human-readable, these 32 bits are divided into four groups of 8 bits called ...

Key Ideas

1IPv4 Address Structure. An IPv4 address is a 32-bit binary value used to uniquely identify a device on a network. To make it human-readable, these 32 bits are divided into four groups of 8 bi...
2Subnet Mask and Logical AND. The subnet mask is also a 32-bit value. It has all 1s in the network portion and all 0s in the host portion. This binary structure is what makes the Logical AND operat...
3Network, Host, and Broadcast Addresses. Within any subnet, three address types are reserved and cannot be assigned to hosts. Understanding these is essential for correct IP planning and is tested heavily on ...
4Unicast, Broadcast, and Multicast. IPv4 supports three types of communication, each designed for different traffic patterns. Understanding these distinctions is important for network design and for the ...
5Public and Private IPv4 Addresses. Not all IPv4 addresses are routable on the public internet. RFC 1918 defines three private address ranges that organisations can use internally without registration. T...

Code Examples

IP Address: 192.168.10.50 Binary: 11000000.10101000.00001010.00110010 Subnet Mask: 255.255.255.0 Binary: 11111111.11111111.11111111.00000000 AND Result: (keep bits where mask=1, zero bits where mask=0) Network Addr: 11000000....
Network Usable Range Broadcast 192.168.1.0/26 192.168.1.1 – 192.168.1.62 192.168.1.63 192.168.1.64/26 192.168.1.65 – 192.168.1.126 192.168.1.127 192.168.1.128/26 192.168.1.129– 192.168.1.190 192.168.1.191 192.168.1.192/26 ...
Requirement Need Prefix Subnet Assigned Hosts Available LAN1 (50 h) /26 192.168.5.0/26 62 hosts (.0–.63) LAN2 (25 h) /27 192.168.5.64/27 30 hosts (.64–.95) LAN3 (10 h) /28 192.168.5.96/28...