Re: Help with theory question on network topology
- From: James Knott <james.knott@xxxxxxxxxx>
- Date: Sun, 21 Aug 2005 07:53:07 -0400
fran_beta@xxxxxxxxxxx wrote:
> I'm trying to mark a paper that deals with networks and I'm trying to
> establish whether a question is correct.
>
> The question offers a diagram of a network topology bringing together
> ethernet (star and bus) and token rings (includes a printer). A number
> of devices are attached to each of the networks. These networks are
> joined by a gateway.
Are you talking only about level two, that is ethernet & token ring? Or IP?
Makes a big difference. Also, define gateway. While it's is technically
possible to bridge ethernet & token ring, it's not common. Gateways
usually refer to IP (or other routable protocol) routers.
>
> The question is whether any of the following statements is correct.
>
> Not all data packets pass through the gateway (My guess, since the
> token ring only passes packets to those with the correct token)
It's possible, though not likely.
>
> Data packets are sent only to the intended receiver (the ethernet
> broadcasts to all nodes, so this can't be true)
If a switch is used, only broadcast frames are sent to all nodes (assuming
the switch tables are current).
>
> All data packets are transmitted to all devices (again the token ring
> networks fails this)
Not necessarily. Can't say for sure, without further details. For example,
if IP it is possible. However, this one conflicts with the previous
question.
>
> Printing cannot be initiated from the devices in the star network (this
> must be wrong since a gateway joins the ring and star)
More info about protocols used please.
>
> Would the answer be different if there were a hub rather than a gateway
> (I assume this would divide the token ring from the rest of the
> network)?
In ethernet, a hub forwards all frames to all devices and in the
conventional sense is a different device from a gateway. Also a hub cannot
connect ethernet to token ring. Ethernet and token ring can be connected
either through a special type of bridge that can convert between token ring
and ethernet or with a router which can connect different technologies.
>
> Is my reasoning correct?
You'll have to expand on the details. You also need to learn more about
level two (ethernet, token ring etc.) and level three (IP, IPX etc.)
networking. Also read up on hubs, switches (including bridges) and
routers.
.
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