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Powers of Two

Lesson 3 of 46 in Coddy's IP Addressing and Subnetting course.

Subnetting keeps asking one question: how many combinations do n bits give? The answer is always a power of two. One bit gives 2 values, two bits give 4, three give 8, and each extra bit doubles the count.

The eight place values of a byte are exactly the powers 2⁷ down to 2⁰: 128 64 32 16 8 4 2 1. Say them until they feel like a phone number you know by heart. Every mask, block size, and host count in this course comes from this row.

Challenge

Beginner

Print the eight place values of a byte, highest first, on a single line separated by single spaces.

Expected output:

128 64 32 16 8 4 2 1

Try it yourself

Terminal

All lessons in IP Addressing and Subnetting

1Bits and Binary

Numbers as Bits Binary to DecimalPowers of TwoRecap - Binary Warm-up

4CIDR Notation

Goodbye Classes Reading CIDR Block Sizes Recap - CIDR Reading

7Special Addresses

Private Ranges Loopback Link-Local Zero and Broadcast

10Capstone - The Office

The Floor Plan Sizing Each Team Carving the Block The Router's View Recap - Ship the Plan

2IPv4 Anatomy

Four Octets The 32-Bit View Network and Host Valid or Not Recap - Read an Address

5Inside a Subnet

Network Address Broadcast Address Usable Hosts First and Last Host Recap - Subnet Facts

8Planning Networks

Right-Sizing VLSM Step by Step Allocation Order Checking for Overlap Recap - Plan a Network

3The Subnet Mask

What a Mask Does Mask to Prefix Prefix to Mask ANDing It Out Recap - Mask Basics

6Subnetting Drills

The Block Size Trick Which Subnet Am I In Splitting a /24 Splitting Again Recap - Subnetting Drills

9IPv6 First Steps

Why IPv6 Reading IPv6 Prefixes in IPv6 Recap - IPv6 Basics

Practice on your own: Terminal playground