思科网络学院CCNA讲座.ppt

文档介绍：A讲座
现代教育中心侯效礼
Semester 1
CCNA 3 working Basics
Chapter working Media
Overview
Copper Media  
Atoms and electrons
Voltage
Resistance and impedance
Interactivity
Current
Circuits
Cable specifications
Coaxial cable
STP cable
UTP cable
Optical Media  
The ic spectrum
Ray model of light
Interactivity
Reflection
Interactivity
Refraction
Interactivity
Total internal reflection
Multimode fiber
Single-mode fiber
Other ponents
Signals and noise in optical fibers
Installation, care, and testing of optical
fiber
Wireless Media  
Wireless anizations and standards 
Wireless devices and topologies
Interactive Media Activity 1
Interactive Media Activity 2
How wireless municate
Authentication and association
The radio wave and microwave spectrums
Interactive Media Activity 1
Interactive Media Activity 2
Signals and noise on a WLAN
Wireless security
Summary
Chapter 3 Quiz