Re: need help on the following interview questions

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
>> >
>> >
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Received on Mon Dec 20 2010 - 16:54:08 ART