>the transport layer provides flow control.
There routinely is flow control at transport (e.g., TCP) and in data
link protools (e.g., LAP-B). Cisco also tends to call source quench
(the use of which is deprecated) and buffering "flow control," but
these mechanisms are not true flow control.
Flow control implies the receiver has an feedback mechanism back to
the sender. Explicit flow control includes mechanisms such as the
RNR frame in SDLC or LAP-B, while TCP uses implicit flow control
based on not receiving ACKs (or receiving delayed ACKs).
Congestion control is really the broader term, which includes flow
control, proactive and reactive queueing, etc.
>
>mjs, ccna
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> > Bob Edmonds
> > Sent: Wednesday, August 02, 2000 12:20 PM
> > To: [EMAIL PROTECTED]
> > Subject: Conflicting answers
> >
> >
> >
> >
> > I have an html file with some CCNA study notes on it and it describes one
> > aspect of the Data-link layer as so:
> >
> > *******************Data Link
> > Layer*************************************************
> >
> >
> > Provides Flow control -- Flow control involves moderating the transmission
> > of data so that the receiving device is not overwhelmed with more traffic
> > than it can handle at one time.
> >
> > ******************************************************************
> > **********
> > *****
> > But while I was taking a CCIE practice test at cisco.com I
> > encountered this
> > question and answer to a question:
> >
> > Q: Some disadvantages of bridging versus routing are: (more than
> > one answer)
> >
> > A. Bridges cannot provide any form of flow control.
> > B. Bridges cannot provide congestive feedback information to end nodes.
> > C. Bridges offer no form of filtering.
> > D. Bridges are more difficult to administer/maintain than routers.
> > E. Bridges create more overhead traffic than routers.
> >
> > Answer = A&B. Flow Control and Congestive Feedback are functions of the
> > Network layer. As bridges operate at the Data Link layer, these
> > responsibilities fall to the end stations in a bridged environment.
> >
> > So my questions is which layer provides flow control?
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > ___________________________________
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> >
>
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