At 12:01 PM 10/10/00, Arun Upadhyay wrote:
>Can anybody please help in solving this problem?
>
>A router is connected to a T1 line which has the
>maximum speed of 1.544mbps. The router begins to
>forward 64bkps packet at 5000 packets per second,
Do you mean 64-byte packets? If you convert that to bits it's 512 bits.
5000 packets of that size per second is 560,000 bits per second, which is a
lot less than 1.544 Mbps so not much buffereing will be needed at all. You
could have just one buffer and no packets should ever get dropped.
>there are 500 buffers available.
How big are the buffers? Can we assume they are 64 bytes also?
>Approximately how
>long before the link is complelety saturated, the
>buffers are full and the router begins to discard.
If you are trying to get help with questions like this that appear on the
CCIE written test and practice exams, you will want to give us an example
of where the WAN link is oversubscribed. For example, if the offered load
to the WAN link is 110% more than the WAN link could handle, 500 buffers
would get used up in about 5000 packet times. (I think? Comments anyone?)
In reality, packets don't arrive at a constant rate, so much more difficult
math and queuing theory is required, and that goes beyond the research and
thinking I'm willing to do right now. &;-)
Priscilla
> Thanks.
>
> Arun
>
>=====
>Arun Upadhyay
>SE Engineering
>MCSE CCNA CNA
>
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