Archive for the ‘Switching’ Category
August 26th, 2008 | 
Author: Key Elements of Ethernet Networks:
CSMA/CD – Only used with half-duplex (hubs).
Full-duplex switches do not use CSMA/CD.
Ethernet signals are sent to every host in the LAN.
Carrier Sense:
All devices must listen before transmitting.
If signal detected (CS), wait before transmitting.
If no tfc detected, can transmit.
While transmitting – must listen for collisions.
Multi-access:
If 2 devices transmit at the same time = collision.
Collision Detection:
Other devices (not involved in collision), and transmitting devices, detect collision.
Tags: study, vtp, 802.1q, guides, switch, cisco
LAN Design:
The Hierarchical Network Model:
CCNA focuses on networks for SMBs (small, medium businesses).
A hierarchical design model is recommended.
Easier to manage and expand.
Problems are solved more quickly.
Hierarchical design divides the network into 3 layers.
Core, (CL).
Distribrution, (DL).
Access, (AL).
Each layer provides specific functions.
This “modularity” facilitates scalability and performance.
Access Layer, (AL): lowest
Interfaces with the end device (user).
Includes routers, switches, bridges, hubs and wireless APs.
Provides a means of connecting devices to the network and controlling which one communicate on the network.
Tags: vlan, wan, ip, guides, vtp, switch