CCIE Pursuit Blog

December 1, 2007

Internetwork Expert Volume II: Lab 2 – Section 3

Section 3 – HDLC/PPP – 4 Points

This was a very short section that sent me running back to my BCRAN books to research PPP (specifically CHAP).  I eventually spent quite a bit of time relearning PPP.

In the HDLC task are are asked to:

…configure this link so that the HDLC header is compressed using a lossless data compression mechanism.

That sounds scary, but it actually brainless because there is only one compression option for HDLC:

r2(config-if)#compress ?
  stac  stac compression algorithm

I lost points on the next task because I did not realize that “ppp authentication chap” makes that device the CHAP server and is not needed on the client side.  I put that on both sides of the link.  I brought up the link, but did not fulfill the task because I had made both sides into servers.


  1. You’re awesome. I’m so glad someone else is blogging scenario details, and that they are from a different provider than what I’m doing with NMC. I’ve already picked up stuff I didn’t know from the last few IE posts you did. This is the best!

    Comment by Ethan Banks — December 1, 2007 @ 5:58 pm | Reply

  2. @Ethan – Thank you. Your blog is my inspiration. The amount of detail and examples that you include are outstanding. If I can return the favor in any small way then it makes all of the typing worthwhile.

    Comment by cciepursuit — December 4, 2007 @ 6:31 pm | Reply

  3. thanks, i really did not observed these details when i reviewed my answer with the solution guide. so thank you. and i will try to do the same. publish details i observe

    Comment by Lol — June 26, 2008 @ 12:10 am | Reply

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