Spanning Tree Cert Question

Spanning Tree Cert Question
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Spanning Tree Cert Question JRW 10-30-2007
Posted by JRW on October 30, 2007, 8:22 pm
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I failed my CCNA by 10 points yesterday and am going to take it again next
Monday (before this exam expires). There was one particular question on the
test that is driving me nuts and I can't seem to find the answer, if anyone
can help, I'd appreciate it. The question was a multi-question multiple
choice scenario with simulated CLI. I had console access to 1 switch of about
6 on a switched network (with a couple of routers thrown in for good measure)
So from this one switch, I needed to execute dubug or sho commands to provide
the answers to the questions. The one that hung me up was "which switch is
the root bridge?" To the best of my recollection, I only had host names for
the switches to identify them. I know I can find the MAC of the root by doing
a "show spanning-tree" - but how can I identify the host name by MAC or the
root bridge by name? Anyone? Thanks!

NMFall 20%
Posted by Slawomir Kawala on October 31, 2007, 5:38 am
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On śro, 31 paź 2007 o 00:22 GMT, JRW wrote:

> the root bridge?" To the best of my recollection, I only had host names for
> the switches to identify them. I know I can find the MAC of the root by doing
> a "show spanning-tree" - but how can I identify the host name by MAC or the
> root bridge by name? Anyone? Thanks!

I'm not sure what information are given in this scenario, but I would
try to do this task just like I described below.

There is a couple of things you have to do:

1. show spanning-tree - gives you root bridge's mac
2. show arp - gives you root bridge's ip
3. show cdp neigh detail - gives you root bridge's port number
4. finally you have to check the topology and find name of a switch which
port number you found in step 3.

Of course for example in step 2 you have to use information from step 1,
in step 3 from step 2 and so on.


--
pozdr. Slawomir Kawala
JID: slwkk [at] alternatywa [dot] net
GSM: (0)601-398-348

Posted by hmmmmmm on October 31, 2007, 5:39 am
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check it out.....

http://www.tek-tips.com/viewthread.cfm?qid=1394667&page=1

using the above info and a little working out you'll find it.......


> I failed my CCNA by 10 points yesterday and am going to take it again next
> Monday (before this exam expires). There was one particular question on
the
> test that is driving me nuts and I can't seem to find the answer, if
anyone
> can help, I'd appreciate it. The question was a multi-question multiple
> choice scenario with simulated CLI. I had console access to 1 switch of
about
> 6 on a switched network (with a couple of routers thrown in for good
measure)
> So from this one switch, I needed to execute dubug or sho commands to
provide
> the answers to the questions. The one that hung me up was "which switch is
> the root bridge?" To the best of my recollection, I only had host names
for
> the switches to identify them. I know I can find the MAC of the root by
doing
> a "show spanning-tree" - but how can I identify the host name by MAC or
the
> root bridge by name? Anyone? Thanks!



Posted by Mario on October 31, 2007, 6:15 am
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you can see the host name using the-show cdp neighbors detail command-but
first you gotta find its ip add or interface on which is connected



Posted by JRW on October 31, 2007, 9:00 am
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You guys rock! Thanks for the input. The only snag I hit was using sho arp -
the remote switches didn't have entries in the local arp table, but I got all
of the ip addresses of adjacent switches from sho cdp neighbor detail, pinged
those ip addresses, then read the MACs from the arp table. This seems like
it's pretty convoluted for a ccna exam - but I guess that's what makes it so
fun! Thanks again to all who posted.

-J









On 10/30/2007 7:22:13 PM, "JRW" wrote:
> I failed my CCNA by 10 points yesterday and am going to take it again next
> Monday (before this exam expires). There was one particular question on
> the test that is driving me nuts and I can't seem to find the answer, if
> anyone can help, I'd appreciate it. The question was a multi-question
> multiple choice scenario with simulated CLI. I had console access to 1
> switch of about 6 on a switched network (with a couple of routers thrown
> in for good measure) So from this one switch, I needed to execute dubug or
> sho commands to provide the answers to the questions. The one that hung me
> up was "which switch is the root bridge?" To the best of my recollection,
> I only had host names for the switches to identify them. I know I can find
> the MAC of the root by doing a "show spanning-tree" - but how can I
> identify the host name by MAC or the root bridge by name? Anyone? Thanks!


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