Hi,
Once the data gets from your physical link into the Telco end it is usually
re-multiplexed into other physical links to go onto the next site. This may go on for
a number of times depending on where the logical link goes. For example, a trace
route may indicate 6 hops to a site to get to the site may require going through 20
physical links. You message get remixed (multiplexed) on each physical link.
That has been my understanding.
Teunis
Hobart, Tasmania
Australia
On Sunday, January 07, 2001 at 01:37:09 PM, Howard C. Berkowitz wrote:
> >I understand most of the benefits of frame relay, but I am wondering if =
> >there are any security problems assoicated with this protocol? Is it =
> >secure enough for unencrypted transfer of financial or sensitive =
> >information? Any help understanding the security risks associated with =
> >frame relay appreciated.
> >
> >-- Kevin
>
> Is a dedicated line secure enough for unencrypted transfer of
> financial or sensitive information?
>
> Answer: It depends.
>
> People often assume that frame is somehow shared when "dedicated
> lines" are not. From Chapter 5 of my _WAN Survival Guide_,
>
> >All too many users have an intuitive belief that if they were to
> >pull on the London end of a London to New York circuit, wires would
> >wiggle in Manhattan. The reality, of course, is that any network of
> >complexity beyond a very simple LAN involves one or more layers of
> >virtualization onto real media. At the OSI lower layers,
> >virtualization usually involves multiplexing, but various name and
> >address mapping functions provide virtual structure as one moves up
> >the protocol stack.
>
> Typically, frame PVCs and T1's run over exactly the same media from
> the customer site to the telco end office. Once at the end office,
> they are multiplexed. T1 is far too slow for economical data
> transmission between modern telco offices. Both the T1 and the frame
> circuits typically will be multiplexed onto facilities at least at
> DS-3, and usually OC-12 to OC-192. So much beyond the local loop,
> there really isn't much difference between frame and dedicated.
>
> Interpretations in the US HIPAA legislation for medical data tend to
> allow unencrypted traffic to flow over dedicated and frame, but not
> the public Internet. The Federal Reserve, however, tends to want
> end-to-end encryption regardless of the media, historically single
> DES. Military traffic would be bulk encrypted and possibly
> end-to-end encrypted as well.
>
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