I saw this on Star Trek once. You have to induce a subspace photon gamma
ray beacon to neutralize the incorrect propogation electron strays in the
data stream.
heh...actually I don't have a clue. Which test is this for??
----- Original Message -----
From: "Steiven Poh (Jaring)" <[EMAIL PROTECTED]>
To: "Cisco Group Study" <[EMAIL PROTECTED]>
Sent: Friday, March 30, 2001 12:30 PM
Subject: ANYBODY HELP ? I cant understand this assigment.....!
> The simulation code you are given treats the Ethernet as a star =
> topology LAN with a central repeater and a line to each node. All =
> traffic appears on every line. The simulation assumes that the longest =
> distance from one station to another across an ethernet is 400m, and the =
> signal travels at 80% of the speed of light, which is 300 million metres =
> per second. Determine D for this network (D is the propagation delay =
> across the network).=20
> Conduct simulations of this network at 10%, 40%, 80%, 95% and 120% =
> nominal utilization. Utilization is the proportion of the time that the =
> ethernet is carrying successful packets. The nominal utilization is the =
> utilization which would be achieved if all packets were successfully =
> carried. For example, 40% nominal utilisation will be achieved when =
> packets arrive at the rate 0.4 * 10,000,000 / (250*8) =3D 2000 packets =
> per second. Some of these factors mean that the actual proportion of =
> time during which the network is busy could be greater or less than 40%. =
>
> In each of these simulations, you should measureor investigate:=20
>
>
> a.. the effective utilization rate (only count bits successfully =
> sent),=20
> b.. the rate at which packets are rejected by the ethernet access =
> layer (also known as the packet loss rate),=20
> c.. packet throughput (ie. 1 - the loss rate),=20
> d.. collision rate (collisions per packet),=20
> e.. average number of packets involved in a collision,=20
> f.. the average number of collisions experienced by a packet given =
> that it experiences one collision, and=20
> g.. the average delay experienced by a packet.=20
> In addition, repeat the simulations at 40% and 80% for a network with =
> 100 times the propagation delay, as might be experienced if the network =
> was extended over too wide a physical distance.=20
>
> Note that the package length in the program is in bytes, and some =
> figures may not be explicitly designed in the program, it requires you =
> to investigate from the program execution statistics.=20
>
> Submission Requirements=20
>
> The submission should be in the form of essay. In the essay, you should=20
>
> 1. determine the number of bits which can be transmitted in the time D, =
> given that the transmission rate of the network is 10 Mbit/s, the =
> average packet length is 250 bytes, and the nominal utilization level of =
> the network is 80%.=20
>
> 2. tabulate or plot these resultsfor the network of LAN at different =
> nominal utilization. Also, you should comment on the significance of the =
> results for the successful management of an ethernet LAN.=20
>
> 3. tabulate or plot the results for the network (ie, 100 times the =
> propagation delays) but only at 40% and 80% of the nominal utilization. =
> You shall comment on the implication of these experiments
>
>
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