Network Devices Explained | Hub, Bridge, Router, Switch

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This video will go over basic network devices. We will see how they work and what they are used for.

Hubs

Hubs were around before switches. A Hubs job is to forward traffic from the source device to the destination device.

A hub is a layer 1 (physical layer) device which means that is does not understand MAC or IP addresses. This is a problem. Because the hub does not know where the destination device is located, it will send traffic out of all ports (except the receiving port) causing collisions and queues which results in packet loss and delays.

Due to the horrific down falls, hubs have been replaced with switches almost everywhere.

Bridges

Bridges are used to separate a LAN network in to segments so that traffic is not sent between them. They work by using layer 2 (data link later) to identify the where traffic should be sent. Now it is worth noting that bridges will send traffic out all ports until it learns (using MAC address) where each port leads.

Switches

You could think of a switch as the heart of a network, pumping blood (traffic) around the body (network). All Devices will connect to the switch and it is the switches job to send the traffic to the correct place. Now unlike a hub, a switch can learn the mac addresses of each port using a Mac Address Table and can also send and receive at the same tine which means no more collisions or delays.

Routers

We have all heard of them and most likely everyone you know will have one in their home. If your reading this on a computer then I bet there is one right next to you.

A router connects your LAN to other networks such as the internet. If your house was a LAN network, your door would be the router. It is the way ‘outside’ of your network.

#ccna #cisco #networking

[chrisguy]

Really easy to understand, clear and not at all boring, just watching them all again before i start trying a few labs. probably not all the info you need to pass ccna but it definitly gives you a clear basis and understanding to work on, BUT ITS thanks guys keep at it!

[jadearrowsmith]

This was incredibly clear, thank you!

[PieterExplainsTech]

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The phenomenon is called "banding". If you open or recreate the background in a graphics program like Photoshop, Affinity Designer or the Gimp, you can add a bit noise to break up the effect.

[electricz]

Such a kind guy. Explain everything clear i understood everything and wrote it on a paper to save it in my brain. Only watching videos won't really help on understanding.

[piyushukla]

Awesome video! Thank you for breaking down such complex concepts making them easier to understand. Thumbs up to you!!

[ft.tanisha.__]

Hubs and switches are used to create network while router is used to connect networks

[radonsmith]

Very helpful for my upcoming network exam. Thanks alot!

[viniciuscastro]

Such a clear explanation, I understood everything. This video has a incredible didatic.
Thank you :)

[themistoclesnelson]

I like it how every time I have a networking question, you have a video for it, whether it be new or old.

[wilsonhawkins]

This is the best explanation I've seen on the differentiation between network devices. Thanks!

[AdnanKhan-sctk]

this was amazing.. now i can say that i know the basics of networking devices..very undersandable..thank you sir

[luketaylor]

Hello I am thrown off by the terms, do you define a router as different then a modem? Or as the same thing? And a WAP is different then a router?
Thanks for your videos.

[alexezeoke]

Every term needed to understand networking is explained clearly. I always come back to Certbros to grasp terms and so clearly.

[aayshasafare]

Class 12 computer science student here! these really helped me revise my computer networking portion.. Thanks!

[itaybarok]

So helpful thanks a lot.
Also, can you dive deeper into bridge and switch way of saving the source mac address and sending to the destination mac address.
Thank you for thus content!
Can you make a full and complete video on using wireshark in networking?
You are truely helpful and you will be great channel keep up the good work.

[leonmehrab]

Easy to understand. Thank you CertBros. Thumps up (y)

[missmegan]

Very helpful for A-Level computer science. Thanks.

[Brock]

really clear video, i now know more about how this stuff works thank you

[olafzijnbuis]

At 00:38 you mean to say "except the transmitting one."
But it is very clear in the animation anyway.

[syedyousafbukhari]

1:24 little error at this point " this means it can't receive data and receive data at the same time" you meant "send and receive" i suppose. Also, love the short informative vids! I am doing my revision after completing the course and it feels relaxing to just sit through these and do nothing else :P