ConceptsARP

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.

Glossary definition

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Concept Neighborhood

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MAC Addresses

The foundation ARP builds on, worth understanding first.

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MAC AddressesStart here

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.

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Relatedsorted by lesson coverage

Frame

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IP Addresses

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OSI Model

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Protocol

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Connection State

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Default Gateway

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Related Lessons

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Network Layers and Why They Matter

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Network Identity: IP Addresses, MAC Addresses, and Attribution

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NAT, Routing, and Traffic Paths

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Thinking About Networks Like a Defender

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