CCNA Quiz: Spanning Tree Explained with Wireshark Captures: Which ports are blocked? CCNA | CCNP

[@davidbombal]

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[@hivasoofieh6921]

I want to thank you 255.255.255.255 times!

[@amittewatia1856]

Great now I think Why I never opened a STP capture while I learned my whole CCNA with Wireshark Thanks again David B

[@nisnopwrd13]

I love getting to know new things thanks David

[@dew569]

Informative video

[@evilmasterneclord]

This is an excellent video! You explain each point clearly and quickly, but also thoroughly. Not only is the content great, but the video and audio quality are superb as well. This is the first video of yours that I've seen and it is so good that I've already subscribed to your channel and am watching another! Thank you for sharing your knowledge, David!

[@davidbombal]

Thank you! And welcome to the channel Zachary!

[@strgtr3531]

Yes I practice on this lab !

[@Peterstevoli]

Hello David, Thank you for the video. Very Much Appreciated.

[@elchinefa9524]

1:17 I love it, thanks for the tip. By the way, when we choose RP for SW2 or SW3 we have to look at neighbour's lowest port ID? If honestly, I thought if I need RP for Sw2 and I have two ports then I choose lowest one from SW2self. And it was right in this example :D, but I'm afraid in another topology this methode can be false,if we have to look at neighbours port.

[@BurninVinyl]

Remember guys: A portchannel a day keeps the spanning tree away :D

[@estebanesquivel5840]

Very good explanation!!!

[@amineraji5707]

Thank you for the videos and I'm working on my first cisco cert CCNA and i find you content helpful, i wish you make a video about cisco trustpoint configuration.

[@quizongilad]

please correct me if I'm wrong, since Sw3 has lowest bridge ID, shouldn't the port gi0/3 of Sw2 get the blocking state?

[@davidbombal]

S1 has the lowest bridge ID, not S3 and becomes the root switch.

[@quizongilad]

​@@davidbombal​I'm in the line of thought that SW3 is not directly connected to SW1. now I understand. thank you so much!

[@yaswanthpopuri242]

David how are you configuring those switches in gns3.. is that a new version or using router as a switch

[@nadeembhat9450]

Spanning Tree

[@lasourisRKO]

if S2 falls, is your network over ?

[@nadeembhat9450]

When I run GNS on my laptop it lags any fix

[@davidbombal]

Virtual environment on your PC will be slower than physical equipment. A lot depends on your PC: CPU / RAM etc. You can ask for help in the GNS3 community here: gns3.com/community/latest

[@nadeembhat9450]

@@davidbombal Thanks

[@garybloise4891]

@@nadeembhat9450 see if you can upgrade the memory also always make sure you have an intel CPU - i7 as high as you can go. if possible! :) Good luck!

[@nadeembhat9450]

@@garybloise4891 I really appreciate sir for your kind advice.

[@quizongilad]

turn off all routers, start one and then got to line conso and issue no exec-timeout command. do wr. then do the same with the rest of the routers. I think I saw this in either github or the gn3 community and worked like a charm.

[@Lucasmathews]

Root port for switch 3 -- interface 0/0 -- has a lower# than interface 0/1? Why would 0/1 be the root port in that case?

[@elikelik3574]

Thanks a lot for this video, it is very helpful. I have a question about VLAN. I watch your video (165. Demo: InterVLAN Routing Part 1) on Udemy. There you do ping from VLAN 11 to VLAN 2 and it works. You use 2 switches and I guess, though R1(VLAN 11) and R2 (VLAN 2) connected to the same switch, when we do ping, the frame goes first to Switch 2 then comes back to R2 (maybe like router on Stick). What is interesting, you do not do routing configuration on L3 switches, you just create virtual interfaces which have IPs and which R1,2,3,4 use them as default getaway IP. Now what about if i have only one L3 Switch and two VLANS ( vlan 10 and 20). Let say I want this two VLANS should ping each other(I know it does not make sense to have separate VLAN on same switch if they should be able to reach each other, but it is just interesting for me). The switch has int vlan 10 (IP 10.1.10.254/24 ) and int vlan 20 (IP 10.1.20.254/24) . PC's in VLAN 10 gateway IP is 10.1.10.254 and PC's in VLAN 20 gateway IP is 10.1.20.254. In other word, I did exactly the same steps which you did on that video but I used only one switch. As i know if we want to go from one network to another then we need routing protocol. But how can I do it on switch?Why you could able to ping from one VLAn to another? Unfortunately, my pings from VLAN 10 to VLAN 20 fails. Hope I could explain my issue =) Regards

[@davidbombal]

Did you enable ip routing on the switch? Type "ip routing" in global configuration mode to allow a switch to route from one interface to another. You only need routing protocols for remote networks, not directly connected networks. Also make sure all interfaces are up using the show ip int brief command (especially the VLAN interfaces - SVIs)

[@elikelik3574]

@@davidbombal Sorry for bothering you. VLAN interfaces are turned on and PCs on the same VLAN can ping each other. I do not understand what exactly should in global config. I Tried this -> switch(conf)#ip route 0.0.0.0 0.0.0.0 vlan20 but it did not work.

[@davidbombal]

@@elikelik3574 Please raise this in the Udemy course for more help.

[@elikelik3574]

@@davidbombal Just now I got my answer from your tutorial in Udemy. You already made a tutorial about interVLAN routing . Thanks a looot. Peace.

[@GregInHouston2]

I don't understand the RP between S2 and S3. I do understand why S3 would choose Gi0/1 as RP. But S2 would choose the other connection. Why does S3 win? Best guess is S3 chooses because it has the lowest Priority. I don't think you said that. And then we get to DP designation. It is not clear to me why S2 Gi0/3 is DP and S3 Gi0/0 is blocked. Why not the other way around? Best guess is that it radiates from the root switch. But I did not hear you say that.