ConceptsMAC Addresses

MAC Addresses

Hardware addresses assigned to network interfaces that identify devices on a local network segment, used for delivery at the data-link layer. They are local in scope, unlike IP addresses, which route across networks.

Glossary definition

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Frame

The most substantial related concept here, covered by 8 lessons.

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ARP

The Address Resolution Protocol, which maps a local IP address to the hardware (MAC) address needed to deliver a frame on a local network. Because it trusts unsolicited replies, it can be abused for spoofing, which is why defenders monitor it.

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FrameStart here

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IP Addresses

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Network

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OSI Model

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Related Lessons

8 lessons cover this concept

Network Layers and Why They Matter

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Network Identity: IP Addresses, MAC Addresses, and Attribution

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Ports, Protocols, and Services

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DNS Resolution and Name-to-Address Mapping

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NAT, Routing, and Traffic Paths

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Firewalls and Segmentation

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Common Application Protocols and Defender Relevance

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Thinking About Networks Like a Defender

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