mohammedmahmoud Thu, 06/21/2007 - 07:54
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Hi,


Frame = Layer 2 header + packet + layer 2 trailer. When talking about layer 2 devices we always refer to frames.


Packet = IP header + datagram. When talking about layer 3 devices we always refer to packets.


They are sometimes used interchangeably but technically they are different.



HTH, please do rate all helpful replies,

Mohammed Mahmoud.


carl_townshend Mon, 06/25/2007 - 01:20
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So if the frame stays on layer 2 its still a frame, and when it crosses a router it adds ip header info so its then called a packet ??

mohammedmahmoud Mon, 06/25/2007 - 01:35
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Hi,


We can think of it as the Frame contains the packet inside it as its payload, as long as the frame is layer 2 switched only the frame header is checked, but if the frame paths over a router, the router will need to decapsulate the frame in order to be able to check the packet header.


NOTE: The frame is constructed in the first place after the packet is fully structured with its ip header.


HTH,

Mohammed Mahmoud.

pciaccio Thu, 06/21/2007 - 09:30
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It is:

S = Segment = Layer 4

P = Packet = Layer 3

F = Frame = Layer 2


Hope this helps...Please rate...

srue Thu, 06/21/2007 - 10:25
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B = Bit = Layer 1 (1's and 0's)


(just for completeness)

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