Archive for Networking Fundementals
Ethernet 802.3 Networks
Posted by: | CommentsInterframe 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.
Read More→
Tags: switch, ip, study, router, 802.1q, interface
Ethernet 802.3
Posted by: | CommentsStandards and Implementation:
The first LAN ever was Ethernet.
Robert Metcalfe and coworkers at Xerox in mid 70s.
The first Ethernet standard published 1980 by DigitalEquipCorp, Intel, Xerox (DIX).
Metcalfe wanted it to be a shared open standard.
1985 IEEE published standards for LANs.
For compatibility with OSI, small mods made to Ethernet standards with 802.3.
Ethernet –L1 and L2:
Ethernet implemented in MAC sublayer and L1 only.
LLC:
The use of these sublayers contributes significantly to compatibility between diverse end devices.
802.2 describes LLC sublayer functions.
802.3 describes the Media Access Control (MAC) sublayer and L1 functions.
LLC – software (drivers) – independent physical equipment.
Tags: study, wan, ip, cisco, interface, guides