OpenDNS, DNS, and Anycast

I wanted to let everyone know about OpenDNS. They provide publicly-accessible DNS servers at the following addresses: This is a fantastic service, and leads me to a discussion on the topic of Anycast and DNS. Anycast is one of the types of traffic flows. Remember the other types: Unicast: used for peer toContinue reading “OpenDNS, DNS, and Anycast”

My Roadmap

CCDE Roadmap CCNA certification (complete) CCDA certification (complete) CCIP certification: training CTT-TAC MPLS Online bootcamp CTT-TAC QoS Online bootcamp tests 642-642 QoS 642-691 MPLS+BGP composite 642-892 Composite reading list MPLS and VPN architectures (Pepelnjak / Guichard) Routing TCP/IP volume 2 (Doyle / Carroll) Networkers presentations QoS (2007) CAC (Call Admission Control) (2007) CCDP certification: trainingContinue reading “My Roadmap”

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”

CCDE Written Outline.. breaking it down.

The CCDE written, as published by Cisco, contains 5 major headings for study. 1. IP Routing. Note: no IPX or Appletalk or anything else. IPv6 basics is a subtopic under ‘generic routing and addressing concepts’ Other than that, no big surprises. I suppose we’ll be concentrating on best practices rather than odd, non-obvious configurations. 2.Continue reading “CCDE Written Outline.. breaking it down.”