Re: need help on the following interview questions

From: travis newshott <tnewshott_at_gmail.com>
Date: Mon, 20 Dec 2010 17:18:43 -0600

The difference between flooding and broadcasting would be one is related to
ports, the other specific to subnets, no? A broadcast on one subnet does
not cause a flood of that frame out ports that are not on the same
subnet(assuming you are following one subnet per VLAN rule).

On Mon, Dec 20, 2010 at 4:27 PM, miken miken <miken_at_sisna.com> wrote:

> 1) TCN BPDU is generated by a topology change and sent north bound towards
> the root bridge to notify the root of the topology change. The root then
> generates a configuration change BPDU that is used to tell every other
> bridge of the change.
>
> 2) If a switch receives a frame with a destination MAC address that is not
> in it's bridge forwarding table, the switch "floods" the frame out all
> ports
> and then monitors traffic to determine what port responded to the flooded
> frame. I think from the switch perspective, flooding and broadcast are the
> same. However to answer the question, perhaps the differences of purpose
> should be noted.
>
> 3) Agreed
>
> Thanks
> MikeN
>
> On Mon, Dec 20, 2010 at 2:21 PM, ehtesham ali <conect2ehtesham_at_gmail.com
> >wrote:
>
> > Hi group ,
> >
> > 1) what happens when a switch receives a TCN BPDU'S ?
> > 2) Difference between flooding and broadcasting ?
> > 3) does a cisco 3750 switch supports MLS and MQC QOS ?
> >
> > my answers :
> > 1) Receiving switch replicates the TCN bpdu and sends it out of its root
> > port , (after acknowledging the downstream bridge ) until the root bridge
> > is
> > hit by TCN bpdu
> >
> > 2) one and the same
> > 3) yes
> >
> > plz give me precise answers for the above questions , and more detailed
> > answer to q 1 he was referring to mac flushing..
> >
> > Regards
> >
> >
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Received on Mon Dec 20 2010 - 17:18:43 ART

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