How switches learn MAC addresses - CCNA 200-301
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- เผยแพร่เมื่อ 3 ก.ค. 2024
- Welcome to Network Engineer Pro. I'm Rafael, CCIE 64356.
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Hello and happy Monday everyone. Welcome to Network Engineer Pro. I'm Rafael, CCIE 64356 in routing and switching.
In this video I talk about the different switching concepts as it relates to Cisco networking and the CCNA (200-301) exam.
This video covers the following objectives in the current (as of fall 2020) exam blueprint:
1.13 Describe switching concepts
- 1.13.a MAC learning and aging
- 1.13.b Frame switching
- 1.13.c Frame flooding
- 1.13.d MAC address table
We'll cover not just theory alone but hands on the cli, examining the MAC address table and some of the options available to us. I will assume you have an understating on how the Address Resolution Protocol (ARP) works. If you don't, no need to worry, here is a link to my ARP tutorial.
• ARP - Address Resoluti...
If you're studying for the CCNA (200-301) or learning networking in general then this video is for you.
I hope everyone that watched this video enjoyed it and learned something.
If you did then be sure to subscribe to the channel !
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Thanks! Good info and great teaching style.
Thanks for watching!
I’m glad it was helpful.
Late to the party but greattttttttttt video.
Thanks you
Welcome!
I liked and subscribed. Thank you for teaching about static MAC address entries, MAC address aging and their configurations on Cisco switches.
Your very welcome, glad you found it helpful and thanks for watching!
Excellent tutorial. Super helpful, Thank You.
Glad it was helpful and thanks for watching!
Thank you so much for explained
Glad it was helpful!
thanks! a very clear explanation
You’re welcome. Thanks for watching!
How does a switch learn the mac address of a neighbor switch interface? On my simulator, they are just always there and don't age out.
Hi chansetwo, both switches, lets say for example SW1 & SW2 are connected with a single link Gig0/0 on both sides. They will be continuously sending messages to each other like CDP, STP, ect. As long as those keep arriving the mac table never ages out. Try shutting down the link on SW2, and view the mac address table on SW1. That specific entry will age out after 300 sec by default. You can speed it up by "using mac address-table aging-time 10" on SW1 or just clear the mac address table. Hope that helps.
Nice explanation, are the CAM-Table MAC-Address Table and SAT same?
Hi Alex, When a switch is doing a mac address table lookup, if a match is found the CAM table will provide the destination port. But to be honest the MAC and CAM tables are used interchangeably.
How did PC1 (AAA) knew that the destination MAC address he needed to contact was CCC if even the switch didn't know it ? It had to be some type of prior communication that told PC1 that the MAC address he wanted to contact was CCC since they could be tens of computers connected to the switch.
Thanks a lot for your videos...
Hey great question, the answer to your queston is ARP. PC1 and PC2 will ARP for eachothers MAC addresses. I mention in the video but assume the PC's have all ARP'd for eachother. The switch would have that info in its mac address table. Eventually the switches mac table entries would age out and it would be empty. Thats where im starting from. Or assume the PC's arp'd for eachother and the switch rebooted.
All these videos and none of them show how the first sending computer knows the destination
I mention early in the video to assume the ARP process has already happened. I do have a separate video dedicated to ARP that is linked in the description.
@@NetworkEngineerPro Appreciate your reply. Thanks for your videos!