Which Layer 2 sublayer participates in encapsulation, and framing

Which Layer 2 sublayer participates in encapsulation, and framing
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Subject Author Date
Which Layer 2 sublayer participates in encapsulation, and framing Mike Scirocco 10-24-2007
Posted by Mike Scirocco on October 24, 2007, 10:23 pm
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I'm taking my first networking class and I'm having trouble
understanding which data link sublayer participates in encapsulation,
adn which in framing. Right now from looking at sites found with Google
and Wikipedia I believe the LLC sublayer is doing the framing, but some
sites break down the frame as having some 802.2 sections and some 802.3
sections.

Can anyone suggest some reading that will help me gain a better
understanding of this?

TIA,
Mike

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Posted by Albert Manfredi on October 25, 2007, 2:21 pm
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> I'm taking my first networking class and I'm having trouble
> understanding which data link sublayer participates in encapsulation,
> adn which in framing. Right now from looking at sites found with Google
> and Wikipedia I believe the LLC sublayer is doing the framing, but some
> sites break down the frame as having some 802.2 sections and some 802.3
> sections.
>
> Can anyone suggest some reading that will help me gain a better
> understanding of this?

The anti-layer activists will perhaps complain, but ...

I'd say that framing, e.g. forming the Ethernet frame, belongs to the
MAC sublayer. The lower half of the Link Layer. And that various
encapsulations available at Layer 2 are provided by the upper half of
the Link Layer, or LLC.

Bert


Posted by Mike Scirocco on October 25, 2007, 5:28 pm
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Albert Manfredi wrote:
> On Oct 24, 10:23 pm, Mike Scirocco wrote:
>> I'm taking my first networking class and I'm having trouble
>> understanding which data link sublayer participates in encapsulation,
>> adn which in framing. Right now from looking at sites found with Google
>> and Wikipedia I believe the LLC sublayer is doing the framing, but some
>> sites break down the frame as having some 802.2 sections and some 802.3
>> sections.
>>
>> Can anyone suggest some reading that will help me gain a better
>> understanding of this?
>
> The anti-layer activists will perhaps complain, but ...

Is there an 'anti-layer' movement? Is it only in this group? I find the
layers very convenient for learning this stuff.

> I'd say that framing, e.g. forming the Ethernet frame, belongs to the
> MAC sublayer. The lower half of the Link Layer. And that various
> encapsulations available at Layer 2 are provided by the upper half of
> the Link Layer, or LLC.
> Bert

Thanks Bert,

I found another source that agrees with what you said here.

Mike



Posted by glen herrmannsfeldt on October 25, 2007, 7:29 pm
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Mike Scirocco wrote:

(snip)

> Is there an 'anti-layer' movement? Is it only in this group?
> I find the layers very convenient for learning this stuff.

There is a story that the seven layer model was defined as
the average of a six layer and eight layer model, between
the US an European groups.

The separation between layer 2 and 3 seems pretty clear, but
the other layers are less and less obvious to me.

It is especially interesting as more and more gets implemented
in hardware, yet isn't part of the hardware layer.

-- glen


Posted by Albert Manfredi on October 25, 2007, 6:49 pm
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> Mike Scirocco wrote:
>
> (snip)
>
> > Is there an 'anti-layer' movement? Is it only in this group?
> > I find the layers very convenient for learning this stuff.

Well, sort of. Some people believe, erroneously IMO, that the 7-layer
model applied exclusively to the ISO/OSI protocol suite. Anyway, like
Glen says, it's not strictly followed in designing hardware. But it is
a useful conceptual tool anyway, again IMO.

> There is a story that the seven layer model was defined as
> the average of a six layer and eight layer model, between
> the US an European groups.

I heard that said about the 53-byte ATM cell, i.e. but not about the 7-
layer ISO model.

In the ATM case, the US wanted 64-byte payloads and the Europeans
wanted 32-byte payloads. The average is 48 byte payload, + 5-byte
header = 53 byte cells.

Bert


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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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