Notes for A2.3.1 Different Types of IP Addressing - IB | RevisionDojo
A2.3.1 Different Types of IP Addressing Notes
Different Types of IP Addressing
The Distinction Between IPv4 and IPv6 Addressing
IPv4: The Foundation of the Internet
Address Size: 32-bit, allowing for approximately 4.3 billion unique addresses.
Representation: Dotted-decimal format, e.g., 192.168.1.1.
Limitations: Exhaustion of available addresses due to the rapid growth of internet-connected devices.
IPv6: The Future of Networking
Address Size: 128-bit, providing about 340 undecillion (3.4 x 10^38) unique addresses.
Representation: Eight groups of four hexadecimal digits separated by colons, e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334.
Advantages:
Vast address space to accommodate future growth.
Simplified header format with mandatory IPsec support for enhanced security.
Key Differences Between IPv4 and IPv6
Feature
IPv4
IPv6
Address Size
32-bit
128-bit
Representation
Dotted-decimal (e.g., 192.168.1.1)
Hexadecimal with colons (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334)
Address Availability
~4.3 billion
~340 undecillion
Header Format
Complex, with 14 fields
Simplified, with 8 fixed fields
IPsec Support
Optional
Mandatory
Public vs. Private IP Addresses
Public IP Addresses
Purpose: Assigned to devices that directly access the internet.
Uniqueness: Globally unique, managed by the Internet Assigned Numbers Authority (IANA) and regional internet registries.
Use Cases: Servers hosting websites, email servers, and any device needing direct internet access.
Private IP Addresses
Purpose: Used within private networks, not directly exposed to the internet.
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Note
Introduction to IP Addressing
IP Addressing is a fundamental concept in computer networking that allows devices to communicate with each other over the internet or local networks.
Think of an IP address as a unique postal address for your device, enabling data to find its way to the correct destination.
Analogy
Just like every house has a unique address for mail delivery, every device on a network needs a unique IP address for data communication.
DefinitionIP Address
A unique numerical identifier assigned to each device connected to a network that uses the Internet Protocol for communication.
