1 © 2004, cisco systems, inc. all rights reserved. ccna 1 v3.1 module 3 networking media

1© 2004, Cisco Systems, Inc. All rights reserved.

CCNA 1 v3.1 Module 3 Networking Media


Objectives


Atoms and Electrons


Voltage


Resistance and Impedance


Current Flow


Circuits


Cable Specifications


Coaxial Cable


Shielded Twisted-Pair Cable


Unshielded Twisted Pair (UTP)


The Electromagnetic Spectrum


Ray Model of Light


Reflection


Refraction


Total Internal Reflection


Multimode Fiber


Single-mode Fiber


Optical Media


Signals and Noise in Optical Fibers


Scattering


Bending


Fiber End Face Finishes


Fiber End Face Polishing Techniques


Splicing


Calibrated Light Sources and Light Meter


Wireless LAN Standards


Internal Wireless NIC for Desktop or Server


PCMCIA NIC for Laptop


External USB Wireless NIC


Access Point


Wireless LAN


Roaming


IEEE 802.3 Wireless Frame Types


Adaptive Frame Types


Authentication and Association Types

Forming an Association is an 8 step process:

1. Clients start off being Unauthenticated and unassociated

2. All access points (AP’s) transmit a beacon management frame at a fixed interval

3. Clients listens for beacon messages to identify AP’s in range

4. The client selects a network it wishes to join

5. The client and AP send management frames to each other, and perform mutual authentication

6. If authentication is successful, the client is Authenticated, but remains unassociated. (The AP knows who it is, but is yet to allocate resources to it)

7. Client sends association request frames to the AP, which responds with association response frames.

8. Client is granted access to services, and thus becomes Associated.


Radio Wave


Modulation


Omni Directional Antenna


Wireless Security

1 © 2004, cisco systems, inc. all rights reserved. ccna 1 v3.1 module 3 networking media

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