Cisco - CCNA Certification 200-301 - Unicast, Multicast and Broadcast .09

Ninth Video in a Series covering all elements of Cisco Certified Network Associate (200-301 CCNA) We start by ensuring we understand the different between unicast, multicast and Broadcast Unicast - One to One Multicast - One to Many Broadcast - One to all Then start by talking about a Broadcast domain. We use an example of a broadcast message to understand how far that message will travel within the network (broadcast domain). We now know broadcast messages are stopped by routers or can be split up further using VLANs After broadcast domains we move into Collision domains. We said, every switch port is its own collision domain whereas with hubs, all their ports are within a single collision domain After understand Collision domains and the problems caused by multiple devices sharing the same medium we jumped into CSMA/CD how understand how Ethernet combats multiple devices trying to send on a shared medium CSMA/CD = Carrier sense multiple access collision detect CS = Carrier sense, PC/host has to perform ’Carrier sense’ to determine if anyone is talking and if the wire is free to send traffic MA = Multiple access, Ethernet is called a multiple access medium simply because the original design was for a Bus topology to which everyone connected to the same think coax cable CD = Collision detection, While transmitting data it’s possible another host may start transmitting at the same time, as when they both waited at the carrier sense, they both thought the wire was clear. If a collision occurs during the transmission. The host will send a ’Jam’ signal to everyone on the collision domain asking everyone to be quiet. The transmission station will then goes through a Random back off (timer) and perform carrier sense before transmitting again. This is why you should not have too many devices on a single Ethernet segment. Also to note every time a collisions occur the back off timer will get bigger. Ethernet will try and put data on the wire around 16 times and eventually give up. If you find this video to be helpful, please do leave a Like or better still, subscribe. This allows me to establish how helpful these videos are and if I should continue with this video series Don’t forget to check out the free CCNA course itself, it covers everything required to pass your CCNA 200-301 exam Full course:  📚Books! 🎓🎓 CCNA 200-301 Official Cert Guide - My fav books: Routing TCP/IP Volume I (CCIE Professional Development): Authorized CCIE Preparation: v. 1 - Routing TCP/IP (CCIE Professional Development): Volume 2 - Learn all about TCP: - Another great TCP book - 📚Books 🎓🎓 How to Study for an exam Study for the CCNA Tips and tricks for the CCNA CCNA 200-301 Training CCNA 200-301 Study CCNA 200-301 Tutorials CCNA 200-301 Full Course 👍👍 Thanks for Watching 👍👍 Want to give back? ☕ Buy me a Coffee - You can find me on: ✉✉ Twitter - @RyanBeney - Linkedin - /RyanBeney - Facebook - /RyanBeneyNetworking - #FreeCCNA #CCNA #Ryanbeney