Re: need help on the following interview questions

You are correct the layer 2 switch dose not have layer 3 logic, if you have
a switch configured with VLAN <x> and 3 different hosts are connected to the
same VLAN <x> if each of them is configured in different layer 3 subnet and
they will all send broadcast even tough they are in different layer 3 subnet
they will all get the broadcast due to the fact that a destination broadcast
in layer 2 is the same ffff.ffff.ffff , the only thing a switch will not do
is pass frame with destination ffff.ffff.ffff from VLAN <x> to VLAN <y>.

On Mon, Dec 20, 2010 at 6:54 PM, miken miken <miken_at_sisna.com> wrote:

> Yes, good point. However, I do not think that a layer 2 switch is subnet or
> layer 3 aware but the VLAN makes sense. Isn't it the host that determines
> if
> the broadcast is in it's subnet, not the switch within a VLAN? Time for me
> to review Clark/Hamilton and Stevens again...
>
> On Mon, Dec 20, 2010 at 4:18 PM, travis newshott <tnewshott_at_gmail.com
> >wrote:
>
> > 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
> >> >
> >> >
> >> > Blogs and organic groups at http://www.ccie.net
> >> >
> >> >
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>
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>

-- 
Shiran Guez
MCSE CCNP NCE1 JNCIA-ER CCIE #20572
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