MAC vs IP Addressing: Key Differences
- Networking Fundamentals & OSI Model
- TCP/IP Model
- Network Topologies
- IP Addressing & Subnetting
- Routing Algorithms & Protocols
- Switching Concepts
- Transport Layer Protocols (TCP & UDP)
- Application Layer Protocols
- Network Security & Firewalls
- Wireless Networking & Wi-Fi
- Network Address Translation (NAT)
- DNS Deep Dive
- Congestion Control & Flow Control
- Error Detection & Correction
- Network Devices
- VPN & Tunneling
- Load Balancing & CDN Networking
- Socket Programming
- Network Troubleshooting Tools
- Physical Layer & Transmission Media
- Data Link Layer & MAC Addressing
- Ethernet Protocol
- ARP (Address Resolution Protocol)
- ICMP Protocol
- Unicast, Multicast, Broadcast and Anycast
- Proxy Servers
- Port Numbers Reference
- Network Performance Metrics
- Quality of Service (QoS)
- Software-Defined Networking (SDN)
- HTTP/2 and HTTP/3 Overview
- 5G and Mobile Networks
- IoT Networking Basics
- VoIP Networking Basics
Two Addresses, Two Different Jobs
MAC addresses and IP addresses are easy to conflate, since every device effectively has both - but each serves a genuinely different purpose within the layered model covered throughout this project.
Local Scope vs Global Scope
MAC address: AA:BB:CC:11:22:33 - meaningful only within the local network segment
IP address: 192.168.1.10 - meaningful for routing across different networksA MAC address identifies a device only on its immediate local network - routers don't forward MAC addresses between separate networks. An IP address, by contrast, is exactly what allows routing across many interconnected networks, potentially across the entire internet.
Fixed vs Changeable
A MAC address is physically assigned to a network interface and generally stays fixed regardless of which network the device joins. An IP address, however, typically changes depending on which network a device is currently connected to - your laptop gets a different IP address at home versus at a coffee shop, but keeps the exact same MAC address in both places.
Which OSI Layer Each Belongs To
| MAC Address | IP Address | |
|---|---|---|
| OSI Layer | Data Link (Layer 2) | Network (Layer 3) |
| Scope | Local network segment | Global, routable across networks |
| Assigned by | Manufacturer (hardware) | DHCP or manual configuration |
Why Both Are Actually Needed at Once
Delivering a packet across the internet requires both: the IP address determines the overall destination network, while ARP (covered in a dedicated note in this section) resolves that IP address into the specific MAC address needed to actually deliver a frame to the right device on the final local network segment.