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In this article I explain how I am preparing for the Wireshark WCNA exam. Study resources 1- Laura Chappell’s WCNA Official Study Guide ( here ) This is one of the best certification study guides I’ve ever read in IT. I loved Laura’s writing style. She sounds friendly and relaxed. No dry text. It sounds as if she is blogging not writing a technical book, which is nice. 2- Stevens’ TCP/IP Illustrated, Vol.1, 2nd Edition (here ) Preparing for the Wireshark WCNA exam requires solid TCP/IP knowledge. Unfortunately, this is one of missing points in the official study guide. So I searched the internet for a reliable source for TCP/IP knowledge. Richard Stevens is to me the best TCP/IP teacher that ever lived on Earth. He explains the TCP/IP stack to a T, using Unix. Even though I have a basic Linux experience (yet), I had no big difficulties following along with his examples. I was excited and ashamed at the same time. Ashamed because I graduated as a network engineer...

Here is a collection of my study notes on the Domain Name System protocol. DNS Hierarchy and Database Remember the format of a URL: Figure: URL format – copyright www.examsmyantra.com The Domain Name System protocol is hierarchical. It’s not flat. If you’ve worked with UNIX and Linux file systems, you’ll notice there is a similarity. The next thing you’ll notice is you have a “dot” symbol at the top of the pyramid. This is the root domain, or root name server . Immediately below it, there are extensions that we all know such as “com” and “org”. These are the Top Level Domains TLD s: The DNS hierarchy © Stanford University Below the TLDs are the second-level domains , such as Cisco, Microsoft, etc. And every domain below them is simply called  sub-domain : Figure: DNS Structure – © usahitman.com The domain name is segmented into different domain levels. Each domain level contains many servers. For example, ...