Posts Tagged ‘lan’
August 15th, 2008 | 
Author: 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
Interframe Spacing:
Minimum spacing between 2 frames following each other on the line.
Time for media to stabilize and devices to process frame.
From the last bit of FCS to the first bit of the Preamble.
96 bit times (9.6 microsec)– time shortens as speed increases.
As we speed up, gap gets shorter as the bits get shorter.
Allows time for slow hosts to process frames.
A = Start Frame Field.
B = Address Field.
C = Type/Length Field.
D = Data Field.
E = FCS Field.
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Tags: switch, ip, study, router, 802.1q, interface