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

5. What options are available for PPP on a serial interface? (hint: ppp ?) For
what is each used?
6. Use a protocol inspector to try “stealing” passwords over PAP and CHAP
lines.
7. What the heck is a “magic number?” Go and find out.
8. What are those acronyms in our debug ppp negotiation? What do they mean?
What is a IPCP and CDPCP?
9. When would you use Microsoft-chap?
10. Does our username/passwords set up under our interface have to match those
put on our router?
So what have I learned here?
In this lab you have learned some of the options available with PPP authentication. You
have seen the five steps in PPP negotiation. You should now be able to define and
differentiate between PAP and CHAP and when you would want to use each. You have
seen that CHAP is better, from a security perspective, because the username and
passwords are encrypted. This means they cannot as easily be “stolen” with a protocol
inspector and used illegally. Do you remember what PAP and CHAP stand for? I would
want to know if I was taking a test on it…hint, hint, wink, wink. In the next lab you will
learn how to use another serial line encapsulation: frame relay.
Guest Router Name Derivation
Terminus, Leftist, and Urvile were three hackers from the Legion of Doom, who lived in
Georgia, that were busted in 1990 by the U.S. Secret Service in connection with the
Martin Luther King Day AT&T long distance network crash. They were known as
“switching gurus” and as “heavy hitters” within the LoD because they frequently
accessed BellSouth’s network. Apparently BellSouth, at that time, did not have very
strict security in place.
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