< All Cisco CCNA Notes

zeyad1991 | Cisco CCNA | Module 2 - Layer 1 Physical

By: zeyad1991 | Related Course: Cisco CCNA | Published: June 14, 2016 | Modified: June 14, 2016
Join Cybrary


Things at Physical Layers:
1- Cables
2- Repeaters.
3- Hubs.

* If a Device works in layer 3 that means he works on all below Layers
Ex: Router is Layer 3 Device (Network) that means it works in Layers 2 & 1 Also.

* Cable Type:
– Xbase-T Known AS (Ethernet Cabling),

– X:stand for Speed in Mbit
– BaseLand Signaling: one signal on the wire at a time.
– BroadBand Signalling: more than one signal on the wire at a time.
– T:Stand for twisted pair.

* Type On Cables:
– Crossover: in-between similar Devices Ex: From Switch to Switch/Router to Router.
– Straight Thru: in-between Different device type Ex: PC to Switch/Router to Switch.

* what does a Hub Do:
– A hub takes a signals in one Port and Floods it out all other ports except the one originated the signal.

< All Cisco CCNA Notes
Join Cybrary

Our Revolution

We believe Cyber Security training should be free, for everyone, FOREVER. Everyone, everywhere, deserves the OPPORTUNITY to learn, begin and grow a career in this fascinating field. Therefore, Cybrary is a free community where people, companies and training come together to give everyone the ability to collaborate in an open source way that is revolutionizing the cyber security educational experience.

Support Cybrary

Donate Here to Get This Month's Donor Badge


We recommend always using caution when following any link

Are you sure you want to continue?