Learning by Doing: CISCO Certified Network ... - SCN Research

Supplemental Lab or Challenge Activity:
1. Change the autonomous number on router to 39. Can the two workstations
still ping each other?
2. Repeat this lab using a class “A” IP addressing scheme.
3. Repeat this lab using a class “C” IP addressing scheme.
So What Did I Learn Here?
In this lab you learned about a new routing protocol called IGRP. Over the next few labs
we will learn more about this protocol and several other ones too. This will help build
your repertoire of routing protocols and look pretty darned cool on a resume too.
Guest Router Name Derivation
John Draper, a.k.a. “Captain Crunch,” gained notoriety in the 1970’s as a “phreaker”
(phone hacker) when he figured out how pay phones work. He discovered when you put
a dime in a payphone (calls in the 1970’s used to be 10 cents) the telephone had an
electromechanical converter that sent a 2600-hertz tone to the phone company as a
“signal” that a dime had been inserted into the telephone. About the same time he
discovered that a whistle given out in boxes of Captain Crunch cereal emitted a frequency
of 2600 hertz. Aha! He then could make telephone calls essentially for free. Shortly
thereafter he also discovered the “Oscar Meyer Wiener” whistles also emitted a 2600-
hertz frequency. Today’s pay phones still work on the same premises. The 2600-hertz
frequency was also used to derive the name for “2600” magazine, better known as “The
Hacker Quarterly” started by Emmanuel Goldstein in 1984.
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