🌐 ARP (Address Resolution Protocol): The IP-to-MAC Bridge
How does a local network map a known IP address to a physical MAC address so data can actually be delivered? Through ARP (Address Resolution Protocol).
Here are the key points:
🔹 1. What is ARP?
A critical protocol that translates a device's logical IP address into its physical MAC address so communication can happen across a local area network (LAN).
🔹 2. How It Works (Request & Reply)
ARP Request (Broadcast): Your computer shouts across the entire local network: "Who has IP address 192.168.1.5? Please send me your MAC address!"
ARP Reply (Unicast): The matching device responds directly back: "That's me! Here is my MAC address."
ARP Cache: Your computer saves this mapping temporarily so it doesn't have to ask every single time.
🔹 3. Security Vulnerability
Because standard ARP doesn't authenticate responses, attackers can exploit it via ARP Spoofing (Poisoning) to intercept traffic on a local network.
🚀 Think of ARP like shouting out a person's name in a crowded room and having only that specific person raise their hand to reveal their face!
👇 Have you ever run the arp -a command in your terminal to inspect your computer's local ARP cache? Let me know!
CyberSecurity #Networking #ARP #MACAddress #IPAddress #TechLearning #InformationSecurity
Top comments (0)