Posts Tagged ‘ethernet’
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
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