ARP Explained - Address Resolution Protocol

What is ARP? This is an animated video explaining how ARP (address resolution protocol) works. ARP resolves an IP address to a MAC address.

[@phemystevens63]

"IP address is used to LOCATE a device on the network and the MAC address is what IDENTIFIES the actual device" 👊👊

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This part really made me got the point without a struggle

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That single sentence explained more than a whole paragraph from some books.

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for me, a computer rookie and non-english native speaker, this is an amazing explanation video for ARP

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I can't imagine of a better way of teaching. Thank you so much professor.

[@PowerCertAnimatedVideos]

Thank you

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Yes, so true

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[@jamesmcv]

I've been a network engineer for over 25 years. It's funny seeing a video on ARP, which we use quite a bit in troubleshooting Layer 2/Layer 3 problems. When I first started, ARP issues were common due to ARP caches not refreshing frequently enough. Every now and then, I'll run into an issue where an IP address change causes a device on the network to stop communicating with the device that changed IPs because it's old and it's ARP cache won't update in a timely manner.

[@aszneemabrotha7347]

doing network stuff in subject called ipt. This helps so much

[@KabelkowyJoe]

And this ARP cache. is probably why i have to reboot system everytime i change subnet address of router, and it's IP, probably only thing Windows "Repair network" tool is doing

[@jamesmcv]

@@KabelkowyJoe Changing the subnet on the router means your Windows PC has to either refresh DHCP (likely) or change the IP of your PC if you set a static IP address (unlikely unless you purposely did it). Windows only refreshes DHCP every 24 hours by default. You could force a refresh or just reboot. Honestly, reboot is just as easy.

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[@taylorlangley900]

Very well explained. I am a new electrical engineer setting up the 10Gb ethernet interface on an FPGA and this really helped understand ARP and Ping packets.

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OMG!Your explanation can understand even a fool like me. Really it's awesome

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You are the best IT expert/teacher because you thoroughly explain the topic with great animation, which enhances learning at a fast pace. With this in mind, I quickly grasp the information after watching your awesome videos. On the other hand, I am in the process of studying for my CompTIA Security+ exam. Please create a CompTIA Security+ exam review video based on version SYO-501.

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@@PowerCertAnimatedVideos 1:37 The router knows who belong to the ip-address so why would the router broadcast the request to everyone?

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@@noodler911 if you're talking about the diagram with the box in the middle and 4 computers, that's not a router that's a switch. Switches don't deal with IP addresses

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[@James_Knott]

One bit of trivia, ARP is actually not part of IP and predates it. However, it was available and did the job. Also, it is not used with IPv6, where Neighbor Solicitation is used. Neighbor Solicitation is part of the IPv6 suite and uses ICMP6.

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Things look very simple when explained by a good teacher, Thanks a lot

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I spent 9 hours, listening, understanding, taking notes, from my professor's 3 hour lecture. And was still confused. yet your 4 minute video gave me a clearer understanding. what an obvious failure the education system has reached

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Wow, why am only discovering this channel now. Your arp tutorial was mindblowing

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Thank you for such a clear and concise video (sharing it with other peers)!

[@fision8090]

I've read a lot of articles about ARM but none explained as well as you, thanks

[@maksteve5451]

ARP not ARM

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You guys always explain things really simply!

[@darioxbrow9223]

ARP protocol An ARP protocol, aka address resolution protocol, is used to resolve IP addresses to MAC addresses. There are basically two types of ARP entries. The first is called dynamic, which is created whenever a computer wants to know whose IP/MAC address it is. So let's say computer A has an IP address but it doesn't know whose address it is, therefore they ask on the network. As soon as the interested computer, so the one that matches that IP address, is found and responds, Computer A will immediately match the IP address to the MAC address. The other type is called static. As we can tell from the name, a static ARP entry is a permanent entry. Why should we use something permanent? We use this whenever we know that two computers will constantly be communicating. If you use the CMD, you'll see there's an ARP cache. In this cache you'll find what devices yours has been communicating with. If there's none, you can still make a new one by writing ARP -r (IP address) (MAC address).

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Best channel for visual learners

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Very helpful and literally understanding, thanks so much. It means a lot!

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I've watched a few videos about this subject. This one was the easiest to understand. Thanks a lot!

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Best explanations. Opened one video and watched 7.

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Racist moment

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Thank you very much...I have been searching for ARP meaning and function. now I understand clearly..my doubt cleared after watched your video...

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Thanks for the wonderful explaination

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[@weishen9511]

Love your lecture clip, now I understand ARP cache. Thanks.

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Great explanation!

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Excellent video. Just read about this in my text book, but needed a stronger explanation to get through my thick skull. This did the job. Thank you!

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Your work is flawless

[@orion.5611]

ARP is used to acquire the MAC address of the other device.

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Great teaching...

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Great explanation.

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Glad you like them!

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Thanks for this explanation on ARP.👍

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[@competitivedoritos4294]

Who is the first one ?

[@m_t_t_]

what happens if a device's IP changes and another device uses that IP? the cached mac address will be incorrect. how is this solved?

[@zubaydee]

As always, you are the best in explaining and make clear!! My question is: While the devices are connected in the same local network, then why a device would need MAC address for talking to each other? They may just use IPs.

[@zubaydee]

I got the answer, devices find each other using IP address but to communicate they need MAC address.

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