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MAC Addresses Explained | Cisco CCNA 200-301
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- Опубліковано 3 сер 2020
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What is a MAC address? MAC stands for Media Access Control. It’s a unique identifier that is assigned to a network interface card, aka a NIC.
This is what a MAC address looks like 08-00-27-EC-10-61. Its a 48-bit (6-byte) address that is used for layer 2 communication.
The first thing to note is that unlike IP addresses, which and can be changed, MAC addresses are burnt into NIC buy the manufacture.
A MAC address has 2 sections. The first 24-bits is called the Organizationally Unique Identifier (OUI) and it identifies the vendor. The last 24-bits is a unique value assigned by the vendor. The result is an address that should be unique in the world.
There are three types of Mac address
Unicast - A unique mac address assigned to an interface
Multicast - An address used to send traffic to a device using a particular application/protocol.
Broadcast - An address that is sent to all devices within a local network.
Why do we need MAC addresses? When are computers are talking on the local area network or LAN, they use layer 2 communication, and layer 2 communication uses MAC addresses. When we leave our network, this is when the IP addresses are used. Routers are layer 3 devices and they mainly focus on IP addresses to get the data to the destination.
#ccna #cisco #networking
I have been studying for the CCNA for about 3 months now and I have not come across something as useful as your playlist here. Thank you so much!
Made it simple. I've already studied this but to have such a uncomplicated explanation to refresh my memory is refreshing.
3:17 This is what I have come here for, and fortunately this question has been answered. Thank you so much!
Glad you got the answer you were looking for Ravi! 👍
You were awesomely blessed with the skill to simplify Networking concepts to a simply point anyone can properly understand. That’s a radical skill in simplification of concepts.
Bravo! What a useful video.
I learned about different representation of the MAC addresses in operation systems and how to see my computer's MAC address on the powershell using the appropriate command. Keep this well and compact lessons
I've commented before on this series. But the quality warrants a continued appreciation. As a career data architect & analyst, this series has cleared up so many questions about how networks work ... things I previously just ignored. Keep up the great work CBs!
Awesome, thank you for the easy to follow explanation.
You're welcome Kevin. Thanks for the comment!
dude u rock!
please upload more videos more frequently
I have learned concepts in this channel way faster than any training course
Thanks Ali! These videos take a bit of time to make but more are on the way. Thanks for the comment, appreciate it 👌
There are few really great IT videos on UA-cam. Yours is in the top 5.
Thank you for such a clear explanation!
No problem! Thanks for the comment 👍
I hope guys like CertBros make money on these videos. They sure deserve it.
Thank you! Yes I do earn a bit of pocket money from the UA-cam ads which helps 👌
I love the way you explain things. Please upload more videos. Thank you for your service.
More to come! Thank you.
Thank you so much for this video!! CCNA Books explain this.. But you do so much better :)
Short and sweet. Excellent content 👍
Thanks Orley. Appreciate it 👍
Thank you for uploading the video. This video helped me understanding the concept easily.
You're welcome Rishita! Glad it helped.
Thank you so much for differentiating Mac and ip address 🙏😊
You're welcome 👍 Thanks for the comment!
Great short video. Very informative and easy to follow.
Thanks T G!
Could anyone explain to me how does MAC address differ from private IP address? I thought of MAC address as a local way for communication whereas IP is a global way for communication, but with private IP addresses, MAC address seems redundant to me.. thanks in advance
Need this to cover some things here at my desk thanks for explaining this its awesome!.
So MAC addresses are the physical device identifiers given to each device to identify each device connected to a local network. When accessing the internet, sites may also access your MAC address to determine what interface to provide to you (windows/Mac etc).
U make things super easy to grasp. Thank You.
Thank you so much for everything you put out here, God bless you 👏👏
I'm going to watch all of the video of this channel to prepare my interview.
Thanks Conor. I hope the interview went well!
@@Certbros It did. Thx a lot, bro. They asked me about some NAT and router concepts.
@@conorbase7776 Great to hear Conor! Hope you get it! 🤞
I have on queation is it posible to have a working phone of pc whithout a mac adres and stil acces the internet ?
Great explanation . It all makes sense at 3:29
Thank you! 👍 Glad you liked it!
Now I’m confused. What’s the point of private IP addresses of you have MAC addresses?
Very good. I understand ip address and mac address better.
Well explained with all aspects of MAC.
Thanks Saqib. Appreciate the comment 👌
I am really looking forward to watching new videos from you, as you are perfect as I said before.
Thank you Niloofar! Really appreciate the support 🙏
Great video, fast and simple. Thanks
Thanks David!
Thank you David!
TIP:
There is better windows CMD command to get MAC Address:
getmac -v
Great tip! Thanks Kicu 👍
Another great video in the series!
just in time !! i take the CCNA in about 5 weeks
Good luck with the exam! I know you'll smash it!!
awesome.. keep the sun onn.. we need that Vit-D
Hello, thanks for the video. Why a router assigns an ip address to the devices within the lan ? Isn't the MAC address sufficient to establish LAN communication ?
Have you got the answer yet?
If I have comprehended correctly, it's because when talking about the communication in the layer 2 (a switch between nodes and under the same network) you must use the MAC address. The IP address comes in when a node want to communicate with the node that is outside its network which means it transfer from communication between nodes under the same network (using MAC addresses) to communication between routers (using IP addresses), and after the data has transferred to the destination network, it will return back to communication between nodes under the same network (using MAC addresses).
even rusted brain like mine can understand your explation
Thank you..
This video is very important ....
Glad you liked it
If mac address is used to communicate on layer 2 via switch then why the communication is lost if u change the ip address?
Like, i change my MAC adress because my mom is turning on Wi-Fi control, can I..like.. change tha MAC address to another one, and then change it to the old one?
Respect from algeria
Thank you for super explanation
Thank you Kiran!
Great video
Awesome, thanks
Thank you for the help!
Great explanation.
Glad you liked it Adriana
I came here because I had a suspicious Mac address connected to my wifi for quite some time and thought its my own devices. I had block the Mac address today hope everything will be fine. I want to know how to trace the mac address from where they connected.
You can use a site like macvendors.com/ to see what type of device that MAC address belongs to. That's a great place to start.
Any tips on how to calculate max address prefix length?
nice. btw, I have no ifconfig on my system (Void Linux). However, ip addr does the job I think
Good to know! Thanks!
question 3:59 so its basically like when u send someone a text it is sending with the help of the mac address ????
please dont judge me i know im dumb
Hello, any chance you could post the full COMPTIA A+? I would be more then happy to donate some money ?
Thanks Zee. I don't have any plans to do the A+ yet but maybe in the future. Security+ is definitely on my to-do list though.
1:26 And the Daddy Joke Awards goes to...
Soooo I am trying to find out how to find the MAC address Destination and Source on Wireshark. But am not sure how to find it. I also need to find out the NIC manufacturer Source and destination, as well as the NIC serial number for destination and source. any clue on how I can figure this all out?
NIC=Network Interface Card (or Controller)
Thank you
Thanks 🙏🏻
3:14 Cisco uses the top one and even microsoft. I rarely see the second one and never seen the bottom one
Why is my pc mac address not popping up
Amazing
Thanks you
what are you doing certbro?!
thanks
Superb❤️❤️
Thank you! 😁
Thanks!
You're welcome!
This is the MAC address I was referring to
EA-D7-A5-60-13-1F
great bro
Thanks man!
wrg, no think that, think any nmw, no nerx
why do we need multiple MAC add
resses?
Super 💜💜💛💛💓💓💕💕💕💕💖💖💖💖
Thank you!
thanks!!!!
No problem!
i love it
I still dont anderstand the consept of uni/multi/broadcasting using MAC adresses !
How can we unicast to a device by specefying a mac address with the least significant bit in the first byte is set to 0, and yet .. mac addresses are always fixed ! That means that a device can be part of either a multicast or unicast based on that specefic bit in its nic burnt mac address !!
Why do we need MAC address at the first place? IP address is unique in a subnet. Can't switches be configured to use IP (as a unique identifier) instead of MAC address?
You can go in settings and configure random Mac address so your Mac address is changed to a random one
Looking for ccna class can you help me out
How to reach you guys
I don't offer any in-person CCNA classes. What is it you are trying to find?
what is the lowest value is it 1 or a in a mac address?
is 0001.9a62.b601 lower than
000a.512a.5cd1?
is 0001.9a62.b601 lower than
000a.512a.5cd1?
Great question. Hexadecimal goes in the below order.
0 1 2 3 4 5 6 7 8 9 A B C D E F
So to answer your question, 0 is the lowest and 1 is lower than A.
thank yoouu
You're welcome!
Can be 2 same mac address in the world
no
they CAN be changed, U CAN change every mac address
World of Tanks :) at 4:22
So, MAC address is like VIN number of a car
🎉
💯👍👍
why do we use MAC address instead of **Private** IP address?
Private IP addresses can be changed and you can have duplicates. MAC addresses are unique and are 'burnt in' to the NIC. This means computers can communicate even without an IP address, for example, when using DHCP.
@@Certbros Oh cool thanks for answering!
@@wat4504 You're welcome! Anytime.
@@Certbros I just wanna say that this series is GODLY and i wanna thank you guys with all my soul for it
@@wat4504 Wow! Thanks for the kind words 🙏 I really appreciate it. It's great to hear these videos are helping.
wrr
♟👍
ررز
It's ipconfig then hit space bar once then / all. Teach the shit properly dude
You forgot to hit enter 🤣
@@Certbros I did not forget. When I hit enter it didn't recognize it....I had to hit space in between to make it work.. you did not teach this properly....typical
Sorry man I thought this was clear. You're absolutely right, you need to have a space before any parameters.
@@Certbros Yea cuz when I first typed it in....it wasn't working....I was like what?.....Then I had to figure out that it was the "space"....initially I typed it as one word. It's still a good video.
Glad you figured it out 👍I'll try to make this clearer in future.