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2420 Views 9 Replies Latest reply: Nov 21, 2011 2:15 PM by FentonRSFezLearn RSS

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MAC Address calculation

Nov 20, 2011 4:15 PM

FentonRSFezLearn 18 posts since
Sep 26, 2009

Hey guys, just a short quesiton about MAC addresses in relation to calculations and indirectly STP RP elections.

 

Wendells ICND2 guide gave MAC addresses such as 2222.2222.2222 and 3333.3333.3333. I basically took these and said well 2+2+2+2+2+2+2+2+2+2+2+2  is less than 3+3+3+3+3+3+3+3+3+3+3+3 (24 vs 36) so the latter one is the lowest and therefore in the context of the question was the root switch.

 

This worked well for me and in examples later in the book this method that I assumed was correct. There is an example later in the book that gives you two slightly more realistic addresses (0019.e859.5380 and 0019.e86a.6f80) and I assumed the same for these addresses. (62 vs 77).

 

Is this the correct way to deal with MAC addresses?

 

Also just an off topic question for those with experience sitting Cisco exams.

 

I have failed my ICND2 exams twice now, both times by about a question each time... I have a horrible fear of failing exams so while I can answer practice exams etc almost perfectly in most cases, I freeze up horribly in exams. That and the testing facility I go to has horriblly small desks that you have to shift the keyboard around to actually have the room to write something down (on paper etc)....v frustrating in testing conditions.

 

If anyone has any tips to deal with these tests better they would be much appreciated.

 

Thanks

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