Packet Traveling - How Packets Move Through a Network
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- เผยแพร่เมื่อ 18 พ.ค. 2024
- This video will illustrate everything that happens to describe how packets travel through a network. Specifically, we will look at every step to get a packet from a host, through a switch, then a router, then another switch, and finally to another host.
This video is the series finale to an article series on Practical Networking.net that explains everything you need to know to understand how data moves through the Internet. You can read the Packet Traveling series here:
www.practicalnetworking.net/se...
0:00 Intro
0:45 Topology Introduction
1:43 ARP Tables, MAC Address Tables, Routing Tables
3:38 Packet from Host A to Host D
11:18 Response from Host D to Host A
14:11 Outro
Here are the rest of the articles in the Series:
OSI Model:
www.practicalnetworking.net/se...
Key Players:
www.practicalnetworking.net/se...
Host to Host communication:
www.practicalnetworking.net/se...
Host to Host communication through a Switch:
www.practicalnetworking.net/se...
Host to Host communication through a Router:
www.practicalnetworking.net/se...
Host to Switch to Router to Switch to Host:
www.practicalnetworking.net/se...
You can read more articles on Network Engineering and Network Security at Practical Networking:
www.practicalnetworking.net/ - วิทยาศาสตร์และเทคโนโลยี
*UPDATED VERSION OF THIS VIDEO: **th-cam.com/video/YJGGYKAV4pA/w-d-xo.html*
That is the new final video of a 13 part video series discussing Networking Fundamentals. You can see the full series here:
th-cam.com/play/PLIFyRwBY_4bRLmKfP1KnZA6rZbRHtxmXi.html
👇
Hello,
This video is the first video I ever published to TH-cam. Initially, I didn't even mean to create a consistent TH-cam presence, this was simply a topic that I felt was better taught visually. All that said, I've come a long way with video and audio recording quality. I know there are a bunch of issues with the audio in this video, but please understand I was very new at recording videos when I published this in 2016. All my newer content is much, much better quality =)
Hope you got a lot out of this, and if you did, I would highly recommend the series I linked above, as it's a much more thorough and expanded version of how Networking works. Cheers!
-Ed
Practical Networking .net
Thanks! I like the updated version since you also show the routing table for hosts.
@@angelperez4735 Glad you liked it too =)
8 years later and this video is still extremely helpful. Thanks!
There's a full series this video has expanded into =) pracnet.net/nf
@@PracticalNetworking Wow! Thank you 👍
So so true! The video is so very detailed and extremely helpful!
Network engineer here. This is phenomenal, man. No matter how far I get into this, I always come back to solidify the basics. This is very simply explained, but straight to the point. The fact you included the switch learning the MAC of the ARP sender is a thing I have not seen in many videos. I hope to start making videos like this soon!
Hi Blake! Thanks for the kind words, glad you enjoyed this series. By the way, I updated this video and made it much better: th-cam.com/video/YJGGYKAV4pA/w-d-xo.html
In fact, you might also be interested in the full Networking Fundamentals series:
th-cam.com/play/PLIFyRwBY_4bRLmKfP1KnZA6rZbRHtxmXi.html
amazing explanation, because u showed every single address at every single point in the journey, which made it really easy to understand, and the animation made it even more understandable , thank you very much sir
Glad you enjoyed it!
@@PracticalNetworking Nice Explanation Sir.
Very straightforward and helpful overview. Would love to see this same style of presentation to explain SDN flow table routing, and also difference between traditional network routing and SDN routing.
Best explanation I found regarding packet travel in the lower layers. Period!
why does he have to talk so fast tho?
This was great! As a suggestion, it would be great to see this tutorial extended to cover routing protocols, eventually explaining a global packet journey from an AS to an another AS.
This is by far the best video I've seen on the subject. The narrative is clearly articulated, the diagrams are well-drawn without sloppy and distracting errors, and the detail is sufficient, without verbosity.
If you are in a break/fix situation, this is perfect!
This is the perfect step by step presentation. This video clarifies all basic doubts. thanks for making this video.
Hi Nagaram, I'm happy it helped. Posts like this are great encouragements to keep making more videos. Although lately I have been more focused on articles. Just finished a couple on VLANs and their configuration. Check them out here: pracnet.net/vlans
Simple to the point and easy to understand. Thank you keep em coming!!!!
Thank you so much! Finally I faund someone understanding how explain something in logical way. I watched video 5 times. All bloggers must learn from you the right way of explaining.
This is by far the best explanation on packet travel...
Hey TH-cam, if you found this video helpful, please share it across your social networks! Also, you may enjoy this short video that explains ARP in less than 5 minutes: th-cam.com/video/QPi5Nvxaosw/w-d-xo.html
Want to learn more about Networking? ... or, are you Studying for your CCNA? If so, here is a list of all my free CCNA related content: www.practicalnetworking.net/index/ccna/
Thanks for the explanation. You made it very simple to digest all different devices, tables and e2e process involved in the process to deliver data from one host to another.
Every video I watch, I can say that I learned new things. It is very well organized and direct to the point. Thanks
Amazing presentation, thank you so much!!
Couldn't have been done any better. Very nicely explained. Thanks a lot.
Thank you, this is probably the only video that actually talks in detail about how all this works, with a practical example.
No matter how old the video is , the was you explained concept won't loose it's flavour. Awesome. Thanks a lot.
You're very welcome =) I'm glad you got a lot out of it!
Great video bro.!!! I was asked about this in a job interview, really basic info, but definitely one of the most important to know and understand..!
You just helped out my whole class with this video. Much Thanx 👍👍
Glad it helped!
6 Years of learning the same thing, and everything finally clicked , thanks to your video .
You have no idea how helpful this way of explaination in .
Absolutely the clearest tutorial series on this subject that I've encountered. Thank you.
Glad it helped =)
I have been looking at courses and videos that describe how packets and frames traverse a network. Yours is absolutely the best! Thank You!
Hi Tracy, glad you enjoyed the video and thank you for the nice words!
Need complex videos for stp and vlans
That was simply an amazing job, thanks a lot for your time creating that.
This vid is amazing! It vividly covers what exactly happens for a packet travelling inside a network. easy to follow and super helpful for understanding.
Glad you liked it, Vic =) Thank you for the kind words.
After numerous websites and videos... this is THE clearest explanation of how a packet moves. Thank you SO much!
You're welcome =)
Great illustration! I'm studying my second year for sysadmin and I felt slightly rusty on this. This cleared it all up :)
Must have taken so much patience to make this video!
One of the best example of Packet Traveling....
This video is beautiful. The concepts are crystal clear now. Thanks !
Brilliant, best and clearest description i've seen. Well done!
Hey Alan, glad you enjoyed the video! If you want more content like this, feel free to check out the blog! pracnet.net.
I'm from India, I should touch your feet to get blessed with knowledge, virtually I did.(great video sir) LOVE from INDIA
That is kind of you to say, Kiran =). I'm glad you enjoyed it. Please tell your friends about this video =)
Perfect clear explanation. Thank you.
The best and precise explanation that I've ever seen on youtube about packets flow. thanks, sir.
If you liked this one, you'll definitely like the updated version of this video: th-cam.com/video/YJGGYKAV4pA/w-d-xo.html
=)
I found this video in r/ccna, I have to say I love this so far. Working my way up from your website currently, thanks for the quality information and presentation.
Glad you liked it, Justin! Thanks for being my first comment on TH-cam ;)
Thanks! i missed some classes due to illness, but your video really help me understand theses concepts. :)
Hi Moe, glad it helped you understand! And thanks for being my second comment on TH-cam ;)! Don't forget to read the rest of the articles in the series at pracnet.net/packet-traveling
Always mind-blowing that this process that takes 15 min to describe clearly (not including the various 20 second backups to repeat/hear again), yet this process happens nearly instantly, practically like magic lol. As always, great video and illustration(s). Thank you.
Exactly! So much goes into Networking, every second, every millisecond! It's a wonder it all works as smoothly as it does ;)
It is really detail explanation, it is very useful video for all the IT professional.
Hey TH-cam! Want to master subnetting? These are the only videos you'll ever have to watch:
th-cam.com/video/BWZ-MHIhqjM/w-d-xo.html
I just want to say thank you. That was incredibly good and thorough explanation. I really wish to understand better docker containers networking. Do you have any resources where I can learn?
One more thing, do you have any ideas and could provide at the end of videos some practical assignments? Although I've understood everything, sometimes when it comes to reality it turns out that I understood something mistakenly.
@@dawidnazarko926 Sorry, somehow I've only just seen this comment! I'm afraid I don't have any suggestions on resources for Docker networking. As for practical assignments, I usually suggest students rebuild the lab topologies they see in videos in GNS3 or Packet Tracer and validate everything they've learned against real gear. That way they aren't just taking the instructor's word for it, but are actually proving it to themselves.
This video is so helpful! Thank you for explaining each step in detail
Glad you enjoyed it! PS: There is an updated version of this video: th-cam.com/video/YJGGYKAV4pA/w-d-xo.html
It's from a full Networking Fundamentals series: th-cam.com/play/PLIFyRwBY_4bRLmKfP1KnZA6rZbRHtxmXi.html
Thank you so much sir...It just clear the whole concept on traffic flowing.
step by step explanation.. Thanks for your Hard work for making this wonderful Video
Truly mind blowing how these network and computer engineers designed our modern day networks. Even more incredible is how they designed networks to communicate including all those network appliances.
Agreed!
Just here to show my appreciation for this explanation!
Keep up the good work!
Cheers! Thanks Jer!
Step by step & clear explanation. Thank you..
Honestly the clearest and the best explanation I have heard so far about this topic, great job !
Thank you Jan. Glad you liked it.
If you liked this, you'll definitely like my new Networking Fundamentals series: www.practicalnetworking.net/index/networking-fundamentals-how-data-moves-through-the-internet/
I'm planning to "one up" this video in the new series =).
Awesome Explanation. Thanks for the detailed explanation. :)
Hi Vinay, glad you enjoyed it!
I really enjoy this video. I have watched it 3 times already. The level of steps and not skipping any of them and the table on the side for all the tables used was very very helpful. Thank you so much for this.
If you enjoyed this one, you'll definitely enjoy the updated version of this video: th-cam.com/video/YJGGYKAV4pA/w-d-xo.html
It's from a full Networking Fundamentals series: th-cam.com/play/PLIFyRwBY_4bRLmKfP1KnZA6rZbRHtxmXi.html
This is one of best explanations of packet travelling I have ever seen. Thanks for sharing.
Thanks for the kind words. Glad you enjoyed it. Maybe you know others that would benefit from seeing this video? =)
Absolutely amazing content and well explained! Better than 3 hours of lecture ;D
Glad you think so!
Thanks for sharing, this is great simulation!
Hi Jatin, glad you enjoy it!
so clearly explanation. Perfect teching
What can I say, This video is absolutely straight forward, it explains the complete details in such a way that can be easily understand. Thanks you so much! i need to review this all over again until it is 100% absorbed.
Hi Shane! So glad you liked it. Thanks for the kind words =)
Slow down the play back speed to 0.75.gr8 stuff.thanks man!
Learned more in this video than what i've learned 2 months from my teacher.
Thanks for the kind words =) Glad you learned a lot from this video =).
Thanks a lot.. This cleared lot of confusion and got clear understanding
my doubts got cleared completely after watching this video
Hi ,Nice presentation which clears my concept..:)
Hi Rajendra, glad it helped! Hope you are well.
God bless you for this detailed explanation. I totally understand it now.
WOhoo =) Glad it all makes sense now!
excellent video, with a detailed explanation of how arp works. Really nice job!
This is such an elaborate explanation of the concept!! Thank you for making this video Cheers!
I was trying to learn the concepts and then apply this practical concept myself but I got stuck in the layer 3 to layer 2 translation.
Literally nobody tells that Routers maintain an ARP table too! Everyone tells that Routers maintain Routing tables, but nothing else.
This video was so good that one can learn the whole Layer 1 to 3 translation within 20 mins!
Thanks a lot my guy! ♥️💯🔥
Glad it helped, Krishn. =)
That's a great explanation sir, I have one question how host a came to know about 11.11.11.1 to send arp request?
Hi Ram. Because Host A's Default Gateway was configured as 11.11.11.1. That is the IP address the host will use to reach something on a foreign network. More details in this video:
th-cam.com/video/QPi5Nvxaosw/w-d-xo.html
@@PracticalNetworking How are default gateway's configured for every device?
That is a great illustration, thank you from the bottom of my heart.
That was a great explanation, wish I had known about it in college! Thanks a bunch!
A big thumbs up from me ...
Although I have one question. In step 2 How does the PC A know or PC will figure out that we need to send ARP frame to 11.11.11.1 instead of 22.22.22.40 ?
Good Question, Rohit, it has to do with Subnetting.
When Host A was configured, it was given an IP address (11.11.11.10) and a Subnet Mask (255.255.255.0). Through the magic of subnetting, that will tell Host A that they are on a network which contain the IP addresses 11.11.11.0 - 11.11.11.255.
Host A was also configured with a Default Gateway (11.11.11.1). This is the address Host A will use anytime in needs to send a packet to an IP address on a foreign network (i.e., anything other than 11.11.11.0 through .255).
Host D's address (22.22.22.40) falls outside this range, so Host A knows the packet must be sent to the default gateway (11.11.11.1).
This process is explained further in the article series. Check them out: www.practicalnetworking.net/series/packet-traveling/packet-traveling/
Ok Got it ... Thanks ..
There is little request.
Can you please take any presentation on switchport ?
like Trunk port,Access port and Native ports. By theoretically it looks simple but when we try to understand the ingress/egress packets from these types of ports it is really confusing :). It will be so helpful if you explain with same manner.
Hi Rohit. I've written some articles which covers those subjects exactly. Check them out:
www.practicalnetworking.net/stand-alone/vlans/
www.practicalnetworking.net/stand-alone/configuring-vlans/
www.practicalnetworking.net/stand-alone/routing-between-vlans/
Host A will not randomly just figure out the default gateway itself your answer is incorrect.
Somehow I missed this comment. But you are correct, what I wrote can be misinterpreted to imply the default gateway is "figured out" automatically. I've updated the post to clarify. Thank you for pointing this out.
Have any material explaining the function of static arp entries in the ARP TABLE of the broadcast addresses below?
IP address 192.168.1.255 Physical address ff-ff-ff-ff-ff-ff
IP address 255.255.255.255 Physical address ff-ff-ff-ff-ff-ff
What types of services are they used for? For example: are they used in DHCP? and on Wake On Lan?
Those are the two types of Broadcast IP addresses, I just created content discussing them:
Quick Video th-cam.com/video/ZNXDbzaAM-I/w-d-xo.html
Detailed Video th-cam.com/video/ny6MsSLb8_o/w-d-xo.html
Detailed Article www.practicalnetworking.net/stand-alone/local-broadcast-vs-directed-broadcast/
Thanks very much for creating this series. This makes the things very easy to learn. highly recommends for the folks who wants to learn the packet routing from host A to host B
You're welcome, Sushen. Thank you for the recommendation =).
Only one sentence, I have for you and that is "You are the best teacher in networking". You explained everything in such a way that any dummy can understand networking basic principles. Thank you very much.
Glad you enjoyed this =)
PS: There is an updated version of this video: th-cam.com/video/YJGGYKAV4pA/w-d-xo.html
It's from a full Networking Fundamentals series: th-cam.com/play/PLIFyRwBY_4bRLmKfP1KnZA6rZbRHtxmXi.html
the voice is not clear and doesn't reflect your confidence
Venugopal Ar unfortunately, this was my first TH-cam video and I didn't have the recording software I have now. My newer videos are much better audio quality.
Thank you for the feedback either way!
Still one of the best videos on this subjects out there. Thank you very much for this!
Wow, thanks! Glad you enjoyed it!
Excellent video, perfect explanation. Thank you for your work.
Thanks for Making this wonderful video... Clear and simple explanations...Helped me a lot...
Clear and very understandable video on the packet creation and travelling. Keep doing the same
Dude. This vid helps clear confusion for many. Keep up posting.
Simply perfect! Thank You!
Excellent video! Clear and complete!
Great Video. This is a nice overview of all i've read in the series of articles.
Thanks for this awesome video. You just explained everything from switches, routers, ARP in a single video. Showed this one in class and it was very helpfull!! Thanks again.
You're welcome =). Glad your students enjoyed the video!
Very Informative and clear simulation, Thank you
Thank you for this amazing explanation. You are a God sent. Very clear and understandable
Hey there! Thank you so much for this video. I am already a CCNA and now when I am preparing for my CCNP, I was finding it difficult to get the concepts right. But this series of your's changed the game for me:) I have never ever commented on any of the TH-cam videos by far but you compelled me to do so. The quality of the content was that high!! Kudos! Looking forward to more videos from you. Keep up the good work:) Can't thank you enough. I could only like the video and subscribe to your channel as a gratitude gesture :)
Hi Vidula! Wow thanks for the kind words. I'm so glad this series has set you up for success. Good luck with the CCNP exams!
The great explanation I have seen to date. Thank you.
Best explanation I've ever seen, most others don't include entries in MAC and ARP tables.
Glad you enjoyed it, Adam =)
the best explanation so far. Doing a good job there
What a great video and more so what a great series. I highly recommend everyone struggling with some networking concepts sometimes to read the full series. Thank you!
Thanks Ewald, I appreciate the recommendation and kind words =)
One of the best packet traveling video I have seen..very clear and it is easy to understand ...Great job
Thank you, Yamini. If you enjoyed this, you'll like my up to date version of the entire series: www.practicalnetworking.net/index/networking-fundamentals-how-data-moves-through-the-internet/
Thank you for such beautiful animation and explanation .
keep doing what you are doing, you are serving humanity at best. You have an ingenious way of sharing your knowledge with those who need it. Your students are following your lead so please keep making more of these videos.
Thanks for the kind words, Patrick! So glad you are enjoying the content =)
Thanks for the graphical explanation
wow, the steps are very clear and detailed. Thanks for the great vid!
Thank you so much...i have been trying to grasp this idea of what happens if the host is on another network and how will the data move through routers and switches in between and thank God i stumbled upon your websites and read your articles and now videos...Helped me a lot in understanding the ARP and How netwroks work. Thank you
So glad it helped =). You're very welcome.
Best video ever seen, amazing explanation for how the packet traverse between switches and routers.
Glad you enjoyed it. PS: Updated version of this video is here: th-cam.com/video/YJGGYKAV4pA/w-d-xo.html
I came to this video after reading the articles. A superb closure. Salute both for the article series and this video.
Glad you enjoyed it, Abel. Just so you know, there is an updated version of this video: th-cam.com/video/YJGGYKAV4pA/w-d-xo.html
It's from a full Networking Fundamentals series: th-cam.com/play/PLIFyRwBY_4bRLmKfP1KnZA6rZbRHtxmXi.html
@@PracticalNetworking Ed, fortunately for me I a newbie to Netowork engineering looking to take the CCNA exam. I will definitely check your series. Plus any advice from you, regarding taking the CCNA exam as a newbie will be much much much appreciated Ed
@@abelashenafi6291 All my CCNA stuff is here, if you're interested: www.practicalnetworking.net/index/ccna/
@@PracticalNetworking Thanks man. Will go through it
hopefully ur not tired of hearing this but this is the best video or explanation so far...i can't count how many other videos i've watched but it was a lot. thanks!
Never tired of knowing the video helps people =). Very happy you found it beneficial!
That's simply the best explanation for packet transfer, great job!
Thank you =). I'm working on the next version of this video... =)
Amazing Video and presentation. I have watched all the 7 videos of the Subnetting series. I was confused as I am preparing for my new CCNA certification by not able to understand the subnetting concepts, like binary method, pie chart method, few second subnetting and magic number methods. After a lot of search I found your video. The table is enough for subnetting and you have explained every step for all the three Octets and nailed down how to speed up the complicate steps as well. Great Man.. Excellent . Keep it up ..The way of your presentation is very clear and simple...
Thanks for the kind words, Karthikeyan, I'm so glad you got a lot out of the Subnetting series and the Packet Traveling video! I hope to keep making more videos as time goes on!