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Fixed a typo

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Justin 2023-09-12 11:02:49 -05:00
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Network_Plus/Network+_OSI.md
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# __Network +__
## __OSI Model__
# __OSI Model__
## __Layer 1__ Bites
* Physical Layer
* It is the connents like Cat 6 RJ45 and fiber.
* It is the connects like Cat 6 RJ45 and fiber.
* Its the on and off on the cables.
---
## __Layer 2__ Frames
* ### Data Link Layer.
* Packagers data int frames and transmits those frames on the network.
* Layer 2 devices view nteworks __logically__.
* Layer 2 devices view networks __logically__.
* ### MAC Address
* Media Access Control
* Physical addressing system of a device which operates on the logial topology.
* Physical addressing system of a device which operates on the logical topology.
* Uses a 48-bit address assigned to a network interface card.
* __EX:__ `D2:51:F1:3A:34:65`
* `D2:51:F1` is the vedor code
* `D2:51:F1` is the vendor code
* ### Logical Link Control
* Provides connection services and allows acknowledgemnt of receipt of message.
* Provides connection services and allows acknowledgment of receipt of message.
* Is the basic form of flow control.
* Provides basic error control functios.
* Provides basic error control functions.
* Uses a check sum.
* ### How communication synchronized.
* Isochronous
* Netwok devices use a common reference a common refernce clock source and create time slots for transmission.
* Network devices use a common reference a common reference clock source and create time slots for transmission.
* Synchronous
* Network devices agree on clocking method to indicate beginning and end of frames and can use control characters.
* Asynchonous
* Network devices reference thier own internal clocks and use start and stop bits
* Asynchronous
* Network devices reference their own internal clocks and use start and stop bits
* ### What Devices are layer 2
* network cards
* Briges
* Bridges
* Switch
* MAC Address
---