Troubleshooting PPP
The Cisco documentation for this is a bit hard to find. I was watching the INE video on troubleshooting ppp and when I tried to find the troubleshooting guide for ppp that was mentioned, I found the same blind alley that was shown in the video.
If you go to the Cisco Support site and go to Technology | WAN | PPP you will find links for: Technology Information, Design, Configure, and Troubleshoot and Alerts. The link to Troubleshooting Guides lists (5) guides, however, when you click the link, you go to a page that is less than helpful. It lists links to: Bug Toolkit, Output Interpreter, Error Message Decoder, Troubleshooting ISDN Connections and Troubleshooting ISDN Connections. Sure enough, there are 5 links - which is where the (5) comes from in the Guides link. However, the first two are tools and the last (redundantly named) link goes to "The Page You Have Requested Is Not Available" - which is the same page that the Error Message Decoder will take you. So the only useful link is the first Troubleshooting ISDN Connections link.
As the owner and content provider of a web site that has been in existence for a while, I can vouch that it's hard to keep up with link integrity for a site that changes over time. Granted, this is probably someone's full-time job or perhaps requires a team of workers to maintain. However, blaming the site for bad links isn't going to get you any closer to your (CCIE) number. You need to be able to find the material no matter where it may have gotten lost. I guess that's the difference between CCIE and CCNA. The CCIE knows that the information resides somewhere and can eventually find it, using various searches, whereas the CCNA performs a casual lookup and then asks for assistance from senior engineers. This is not a knock against CCNAs - everybody has to start somewhere. And I know this method because I have used it myself at times. What I'm suggesting is that if you're reading this blog, you want to draw a line in the sand here and now and decide that you will take responsibility for finding your own information - regardless of how creative you need to become to find it. It may be frustrating at first, but it will teach you how to think like "they" do - those experts that we want to become.
I followed the link for Troubleshooting ISDN Connections. Granted, ISDN is not on the blueprint for the lab anymore. I think they removed it when they added the MPLS material. However, it is still on the site. And at the bottom of the Table of Contents, I found :
Troubleshooting PPP - complete with links for LCP, Authentication, and NCP.
It actually shows the debug of a successful PPP negotiation and covers troubleshooting various aspects. There's really not a lot to this, but it looks like something that could be helpful to have seen. Personally, I prefer the way Brian M demonstrated this in the video - it's a bit cleaner and more focused on what you may have to deal with in the lab exam. But if the video went too fast and you want to see this on paper, this is where you can find it. Of course, if you don't have access to the INE videos or the INE Troubleshooting Course, here is where you find the same information on the Cisco site.