"Where IP meets MAC—ARP makes the magic happen explained in 15 min"
Автор: ER Abhishek Anand (Senior Network Architect )
Загружено: 2025-12-08
Просмотров: 59
⭐ What is ARP? (Detailed Explanation for YouTube)
ARP (Address Resolution Protocol) is one of the most important but invisible components of computer networking.
Whenever a device on a local network wants to communicate, it needs to know two things:
an IP address (logical address)
a MAC address (physical hardware address)
Your device may know the IP address it wants to reach, but it cannot send packets until it knows the MAC address associated with that IP.
That’s where ARP comes in.
🔍 How ARP Works (Step-by-Step)
Your device says:
“Who has this IP? Please send me your MAC address.”
(This is an ARP Request, broadcast to everyone.)
The device that owns that IP responds with:
“I have that IP. Here’s my MAC address.”
(This is an ARP Reply, sent back directly.)
Your device stores the IP–MAC pair in the ARP table.
From this point onward, traffic can be sent directly without repeating the broadcast.
📘 Why ARP Matters
It allows communication between devices on the same network.
It ensures packets reach the correct machine.
It keeps local communication efficient by storing recent address mappings.
Troubleshooting ARP often solves many network issues.
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