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2

Is it possible to prevent YouTube cast to tv?

I've tried separating 5ghz band from 2ghz with different ssid and password but no effect. I'm just trying to relax in bed with my anime songs but constantly worry about tapping that **** button.......... My family just doesn't understand what they're missing.

You'll need to put the TV on a different subnet. The easiest way is to put it on a separate VLAN, though most consumer gear isn't going to be able to do this. Ubiquiti stuff can, but you'll need to have a solid understanding of basic networking first.

One suggestion would be put parental controls on your TV, so after X time it can't connect to the network. Though that will cause some problems when you want to use it later at night or something.

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Original Poster1 point · 4 days ago

I'm actually studying my ccna so I could probably pull it off if I had the right gear, only I don't think the reason is enough to justify it, seems kinda silly honestly 😅 thanks for the info though

If studying for a CCNA, you will soon want some gear that's at least a little more configurable most likely.

Take a look at some ubiquiti stuff.

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Original Poster2 points · 4 days ago

I'm definitely interested in customising my home network but I will hold off until I have a thorough understanding of it all.

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17

Difference between using serial cable and Ethernet cable between routers?

I’ve just started routing and I’m curious to why we use serial cables instead fastethernet .

Part of the reason you hear about it is, in Packet Tracer they do alot with serial cable connections because it works in the program. Ethernet has some bugs in packet tracer when connecting routers together. That's about the only reason :)

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Original Poster1 point · 5 days ago

Yh I tried ethernet between two routers with a static route, maybe I misconfig or maybe error, I plan to try again later

Firstly I have the most recent cert guide and it's still referencing the lease lines and serial.

Secondly you should really be using the newest books because things are always changing

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Original Poster1 point · 5 days ago

I plan to get up to date

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How did u already work in that role before the incd qualifications, was it because of experience? Also what are the daily tasks of your job.....I’m super new to networking and pretty curious 🙏

3 points · 26 days ago

No. Vlans are layer 2. Default gateways are layer 3. Vlans tag and segregate traffic at layer 2. Layer 2 will contain layer 3 information.

Native / default vlan are usually referred to as the untagged vlan for a specific port. There can only be one untagged vlan per port. This is usually defined by the pvid for the port.

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Original Poster1 point · 26 days ago

Does each port have its own native vlan or is it for the whole switch

By default all port’s native VLAN is 1. It stays that way unless manually changed. Native VLAN changes can only be done on ports configured as trunk ports. (Using “switchport trunk native vlan x” - where X is the VLAN number).

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Original Poster1 point · 16 days ago

Thanks

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2

What job can u get with just a ccna

I currently work 50hr In a restaurant and Im tired of it. It's kinda depressing but I stay optimistic. So long story short i chanced upon an IT course and they offered me to take comptia but I decided on ccna R&S because Im losing patience in my current job. I know there is a big difference between them and the Admin at the course explained the best path but I can't wait. So now I'm a quarter way into ccna and im interested in knowing what kind of job I could get afterwards. I'm not expecting anything grand, but whatever I find will most likely be better than my current job. (p.s. I plan to continue my studies after passing but I just need a job change first) BTW I live in Edinburgh

1 point · 19 days ago

Someone with no professional IT experience is going to start off like everyone else, as a tier 1 doing basic helpdesk/desktop support. In which case certs like A+ or Net+ actually make more sense to pursue early on or before applying since they relate to that role. Either way, you have to find other ways to stand out on your resume and during interviews to set you apart from the dozens of other people who will be applying for the same position and likely already have the previously mentioned CompTIA certs (and maybe more experience).

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Original Poster1 point · 18 days ago

Thanks

Thanks for the motivation and congratulations hats a huge achievements. Most of my friends are still working helpdesk 5+ years.

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Original Poster1 point · 18 days ago

Thanks as well 😁

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2

Vtp and etherchannel

I tried connecting two switches with two physical cables, then turned them into a port channel active, trunk. Afterwards I set up vtp server and client but there was no updates at all. I finally connected a single cable between both switches and set as trunk, which worked. My theory is that vtp doesn't go through ether channels....... I think

So you configured the 2 switchports as etherchannel? Considering the mode was active, you used LACP. Did you enter interface po <#> switchport mode trunk On both sides?

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Original Poster2 points · 24 days ago

Yes I double checked, and I will try to post configs in future posts

3 points · 24 days ago

That theory would be incorrect.

While mildly interesting, you've done no troubleshooting and provided no configs, so my default answer is going to be you missed something. Did you test the EC before setting up VTP? Did you debug your VTP server? How long did you wait for an update?

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Original Poster1 point · 24 days ago

I will post configs in my future posts!

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7

Ether channel question

What's the difference between pagp and lacp. I know they have different modes but..... What's different?

PAGP was Cisco’s first dynamic etherchannel before the standard. Nowadays you’ll most likely use LACP for everything as PAGP only has some obscure benefits in some situations and isn’t supported on servers like LACP is.

You’ll most commonly use a version of PAGP with inter-device stacking (VSS) but that is something you won’t have to think about for quite a while.

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Original Poster1 point · 24 days ago

Nice to know

3 points · 24 days ago

As others have said, PAGP is the cisco proprietary protocol for link/port aggregation, while LACP is an open standard. As far as differences, you'd have to read the standards themselves to really figure that out. For the most part they function the same. They have aggressive/passive negotiation and can do hashing based on several fields such as source mac/dest mac/source ip/dest ip, and so on.

Most people use LACP due to it being the open standard that is compatible with other vendors. PAGP is required for a few cases such as 6500 series L3 switch VSS. PAGP doesn't support a few things when it comes to certain platforms as well. There is probably too much to really go into details because they are all very specific cases of when to use one or the other. For the most part, its probably better to default to LACP. You'll have to read the actual standards if you wish to know more details of the differences.

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Original Poster1 point · 24 days ago

Very detailed thanks

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2 points · 25 days ago

Try connecting directly with ethernet cable then test speed to help rule out signal interference/block

4

Vtp advice

How long does it take for the changes made to server take to reach client, is it instant or delay? Also anyone have any tips or good advice for using vtp?

Advice: don't use it.

The VTP update is immediate after a change and is nearly immediate to all other devices (take into account propagation and processing time)

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Original Poster1 point · 26 days ago

Only for the exam, I doubt I would rely on it for real life

Updates made to the VLAN database on a server device will trigger the server to send an update advertisement out by default. This will be accepted by all the client and other server devices. Otherwise vtp messages are sent out every 300 seconds by default.

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Original Poster2 points · 26 days ago

Thanks, best answer 😁

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The WiFi is not the issue I think, it's more likely the game settings thats it

3 points · 27 days ago

I've only recently started as well and so far the theory and packet tracer does good. I suppose towards the exam time I might look into live labs but for now just studying.

1

Trouble with links

So my connection from switch to router is access not trunk. I managed to ping hosts on different networks but when I read that it should be a trunk link, I went back and changed it so, but now it won't go through....... Where did I go wrong?

It should only be a trunk if you're using subinterfaces on the router. If you don't have subinterfaces/VLANs on the router, the switchport should be an access port.

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Original Poster1 point · 27 days ago

So basically single interface is access Subinterfaces is trunk, BTW I just started subinterfaces😁

0

Command questions?

[Interface vlan] or just [vlan]. What commands can u do in each mode?

Do a ? and find out! :)

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Original Poster1 point · 27 days ago

Face-palm

Original Poster1 point · 28 days ago

Nice one guys

0

Wireless radiation?

I spend hours managing deliveries but I'm afraid of being so close to so many tablets that use WiFi and Bluetooth connections. I'm not trying to overreact but when we're talking 5 different devices within half a metre of me....... 😅

The harmful types, such as X-ray and gamma radiation is not emitted by bluetooth and wifi devices.

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x-ray and gamma are ionizing radiation. Microwaves are nonionizing radiation. Both can damage DNA and cause cancer:

[WIKI] DNA and RNA damage induced by mobile phones

http://goedhartvoordieren.nl/?page=r/Electromagnetics/comments/801q8c/wiki_dna_and_rna_damage_induced_by_mobile_phones/

[WIKI] Brain Zapping: MicroRNA and DNA breaks. MicroRNA is a biomarker for blast traumatic brain injury (bTBI)

http://goedhartvoordieren.nl/?page=r/Electromagnetics/comments/427765/wiki_brain_zapping_microrna_and_dna_breaks/

[WIKI] Cancer: Mobile phones cause tumors and cancer

http://goedhartvoordieren.nl/?page=r/Electromagnetics/comments/4dept5/wiki_cancer_mobile_phones_cause_tumors_and_cancer/

[WIKI] Cancer: Radiofrequency: Cordless Phones

http://goedhartvoordieren.nl/?page=r/Electromagnetics/comments/6yk51h/wiki_cancer_radiofrequency_cordless_phones/

[WIKI] Cancer: Radiofrequency: Wi-fi, bluetooth and zigbee

http://goedhartvoordieren.nl/?page=r/Electromagnetics/comments/6yk3zu/wiki_cancer_radiofrequency_wifi_bluetooth_and/

/u/Falable, the following wikis answer your question:

[WIKI] Wi-Fi: Papers on the adverse effects of wi-fi

http://goedhartvoordieren.nl/?page=r/Electromagnetics/comments/6bi7gl/wiki_wifi_papers_on_the_adverse_effects_of_wifi/

[WIKI] Wi-Fi: Articles on the adverse health effects of wi-fi

http://goedhartvoordieren.nl/?page=r/Electromagnetics/comments/3zvv2q/wiki_wifi_adverse_health_effects/

[WIKI] Bluetooth: Adverse health effects and mitigation

http://goedhartvoordieren.nl/?page=r/Electromagnetics/comments/4anolo/wiki_bluetooth_adverse_health_effects_and/

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Original Poster1 point · 27 days ago

Thanks man

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16

How does interfaces naming work?

I understand fa0/1 to fa0/24 and the same for gigabit, but why is zero then slash, does that mean u can have fa3/7 and so on. BTW I've only covered switching not routing yet, so ignore my ignorance 😁

16
1

Calculating the powers of 2

E. G. 9 network bits and 14 host bits How do work out number of host addresses, as in how do I do 214 without a calculator 😅

Comment deleted1 month ago
Original Poster2 points · 1 month ago

Thanks man

1

Trunking problem

I’ve just started the this topic so I thought to have a little practice on packet tracer. I set up two switches and pcs connected to each switch. I Got the cabling right. All the hosts are on the same network and vlan. Ports connecting switches were set as trunks.

So everything was working fine and the pings received............until I added a third switch between the original two switches. I made sure the ports connecting the switches were set as trunks but the pings were no show. Any idea where i made a mistake or have I just not covered the next part of the topic yet? (P.s how should I add my screenshot into this post?)

Does the VLAN each of the PCs reside on exist on the 3rd switch? Like if the PCs are on VLAN 20, does VLAN 20 exist on switch 3?

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Original Poster5 points · 1 month ago

No there’s only default vlan on the 3rd switch, while the pcs are all on vlan 7. Man it’s a rookie mistake. Good thing I’m practicing what I learn before getting ahead of myself 😂

2 points · 1 month ago

Learn subnetting

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How long did it take you to fully grasp it?

If you're looking for a simple but engaging strategy/roleplaying/card mobile game you can pick up and put down at will, try Reigns. I believe it's $2.99 on the for iOS/Android and frequently goes on sale.

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Thanks

Original Poster3 points · 1 month ago

I miss it too, makes sense it’s gone though. At least it’s in horde kinda.

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2 points · 1 month ago

Was it broken or was it overused

2 points · 1 month ago · edited 1 month ago

I'm in the process of releasing a Subnet Mastery video series... The first video just released yesterday (I'll make an announcement on /r/ccna later this week). But check it out:

https://www.youtube.com/watch?v=BWZ-MHIhqjM

This video explains the seven attributes you can extract from a subnetting problem.

Aka, if I were to give you an IP and Mask (ex: 10.2.2.30/28), there are 7 different things you can learn:

  • Network ID
  • Broadcast IP
  • First Host
  • Last Host
  • CIDR/MASK conversion
  • Next Network
  • Total # of IP Addresses

The linked video explains what each of these are. The videos that follow explain how to solve for them. They use the method /u/xChooChooKazam mentioned in his post.

Edit: If you (or anyone) watches it, I would love to hear your thoughts!

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Original Poster1 point · 1 month ago

I'll watch it ASAP, thanks

Let me know what you think and if you have any questions. I'll do my best to answer.

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Original Poster1 point · 1 month ago

Thanks

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