written – security without obscurity

CCDE Topic: docs I found useful

CCDE Topic: docs I found useful Step One: the written (read this even if you already passed!) I found the written outline to be the most useful preparation not only for the written exam, but also the practical. I went through all of the topics outlined and made sure I understood exactly what they wereContinue reading “CCDE Topic: docs I found useful”

What is the issue with re-marking and OoO packets?

This question, taken from the CCDE Written Outline, taught me something new. Since that’s the purpose of any certification, I welcome these interesting, if somewhat vague, questions. The main issue with re-marking and Out-of-Order packets can be found in RFC3819: (aka BCP89) “reordering does come at a cost with TCP as it is currently defined.Continue reading “What is the issue with re-marking and OoO packets?”

CCDE Written Outline Topic 4 : Logging Config Changes

For “Identify best practices for configuration management (i.e. logging config changes, auditing “as running” vs “as configured,” consistent feature application, etc.)” I found some information in the IOS Configuration Fundamentals Configuration Guide. Specifically, how to configure logging of config changes.

CCDE Written Outline Topic 5 : Security

Topic 5 : Security is not fleshed out as far as the other four topics, so I thought I would tackle it first. Explain the impact of security availability design in the characteristics of a network.What does this mean? Let’s dig into the subtopics and see if we can find an explanation. OOB Access –Continue reading “CCDE Written Outline Topic 5 : Security”