Everything Switches do - Part 1 - Networking Fundamentals - Lesson 4

Aren't the ARP request for the MAC address of Host D supposed to do that 'Learn' & 'Flood' part of the Switch? I know the demo is based on already knowing the MAC of Host D, but I'm curious about when it didn't.

Criminal you're not doing the entire course. I'm entering back into university and this is such a flawless tutorial from top to bottom. I'd have no issue paying for the full course.

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when Host A sends an ARP in case of switch will it add IP of switch?
ok lets take it step by step
Host a send an ARP Host D receives the ARP macthing its IP and send back the ARP with its MAC, now host A knws the mac of B then WHY does switch need to flood the network? when it already knows the mac? of D when it sent back the ARP response to A's ARP request

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how does host A do ARP request first time with the switch with no populated MAC-port table?

Well done, sir 👏

Considering scenario Host-A needs to send data to Host-D - How does Host-A knows the address of switch for the very first communication ? I believe ARP might help here but does ARP knows where to look for? I understand we use default gateway when router comes to picture. similarly I want to understand it for switch @PracticalNetworking

Thank you!

when is the course coming out?

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Hey @PracticalNetworking,

Thank you so much for posting this tutorial and helping us in understanding the concepts in simple and best way. all content I was searching about networking in the past two days, I have got it in this series itself. I will definitely recommend this to others and share the videos as we.. Thanks once again for posting this kind of tutorials which are helping us a lot.

I didn't knew switches were this dumb and simple. :)

thank you very much man!!
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your course is very helpful.

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Very good video.

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Thank you so much sir!
Awesome explanation for every subject!

Thank you very much...

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But what orchestrates all this? What hardware/ software?

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This is fantastic! So simple and easily explained - thank you.

This series is the best networking tutorial I have seen so far on the internet. Thanks for doing a great Job.

I am giving you 10 out of 10 .

Thanks a lot! But I was wondering just one little thing. You intentionally left ARP out of the equation in order to not repeat yourself what has already been said.

So if a sending host already knows the L2 details of a receiving host, ARP must have been performed before. So shouldn’t then the MAC Address Table of the switch already have ‘learned’ the connection details (port - MAC address) while ARP was performed in the first place?

Thanks!

what happened if you interchange the port? does the mac address table always update itself for every traffic? if it does update, does it consume high traffic resource as the number of host increases?

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PERFECT!!!

Absolutely awsome sir,

Please continue creating more networking videos. You explain it in such a way that I always understand by the end. The best out there for me. Would love to see you cover all the aspects. Thanks for spending the time to put these together for free!

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Exceptionally well explained !!!!! Thanks a ton ☺☺

@PracticalNetworking, I have one doubt If you please clarify, A sent frame to D, which means that A has L2 information, having L2 information basically means that ARP has been already done. So in the process of ARP switch did Learn the MAC of A and D. So which basically implies that switch table does have information of A and D mac address. Which basically means flooding never occurs. Am I missing something? Please tell me

Amazing channel , thank you for this free course , does the access-point works the same way as the switch ?

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Thanks for the effort. Its great content.

Hi could you please help me about the address field of HDLC frame? one router sends an HDLC frame, the frame can go only one place: to the other end of the link. So, while HDLC has an address field so what's kind of address it uses and L2 like MAC address or L3 like lP address.

Great video!

Very explicit! Thanks Sir.

This is amazing!!
You are a great teacher. Thanks for your explanations so simple to understand

thank you, let's boost the algorithm!

Thank you for your videos, they are a great resource.
In this video we assumed Host A knows the MAC address of Host D. What if it didn’t? Is it possible for the switch to ‘Learn, Flood and Forward’ during the process when the ARP request/response is made?

and 1 more bump !!!

If switch is configured to have an IP address, will it then be a Layer 3 device?

So in simple terms ; switch is a hub with mac address table , correct ?

Thank you