David’s Cisco Networking Blog:

CCNA


August 25, 2008  9:18 PM

Eight Decimal to Binary Conversions to memorize for CCNA certification



Posted by: David Davis
CCNA, Cisco, Networking

128 – 1000 0000 64  -   0100 0000 32  -  0010 0000 16  -  0001 0000 8  -   0000 1000 4  -  0000 0100 2  -  0000 0010 1  -  0000 0001

August 23, 2008  9:08 PM

Seven Acronyms that will come in handy for CCNA certification



Posted by: David Davis
CCNA, Cisco

ABR – Area Border Router:  A router that has interfaces in many OSPF areas. For more information on ABR, visit: Managing...

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August 22, 2008  8:41 PM

The three main Network Topologies and how they can work for you



Posted by: David Davis
CCNA, Cisco

Studying for the Cisco CCNA or CCENT? You will certainly run across networking topology questions. Here's a quick review: First of all let’s define what a topology is- Simply put, a topology is the layout of a network. There are really three basic types of topologies. They are Star, Bus, and...


August 21, 2008  8:29 PM

Determining the Network ID using the Logical AND Operation



Posted by: David Davis
CCNA, Cisco

Studying for your CCNA? Having trouble with IP Subnetting? It’s all about the 1’s and 0’s. We just need to convert our IP address and Subnet mask into binary and then subtract the ones from the zeros. 1+1 = 1, 1+0 = 0, 0+1 = 0. It really is that easy. Let’s find out what the network...


July 30, 2008  9:27 PM

Cisco’s new LearnNetSpace website has a lot to offer



Posted by: David Davis
CCNA, CCNP, Cisco

Cisco has unveiled a new web site - LearnNetSpace - to help us in a dedicated forum to share problems and helpful solutions that many of us have learned through trial and error. Networking with your peers is a great solution. I was...


July 24, 2008  9:25 PM

Three show commands that will help you as a Cisco Admin



Posted by: David Davis
CCNA, Cisco

Show version – This command lists information like the IOS filename and version currently in use. Another very important thing this command shows is the configuration register value The register value 0x2102 is the default factory value. You will need this value, for instance, if...


July 23, 2008  9:15 PM

Cisco IOS what, when, & where questions



Posted by: David Davis
CCNA, Cisco

Here are 3 Cisco IOS questions that you should know the answer to: Question: What is the purpose of ports? Answer: Port numbers allow hosts to identify which application processes send and receive data inside TCP and UDP datagrams. Question: When an engineer wants to...


July 22, 2008  9:06 PM

How to restore the backup configuration file from a HyperTerminal Emulator



Posted by: David Davis
CCNA, Cisco

In a previous blog entry (

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July 20, 2008  9:01 PM

5 Cisco IOS Terms that you should know



Posted by: David Davis
CCNA, Cisco

When preparing for your Cisco CCNA or just learning the IOS, there are a number of terms that you need to know. Here are 5 of them: 1. Administratively Down – One possible interface on a Cisco router. 2. Assignable IP address – An IP address that can be...


July 19, 2008  8:57 PM

Using Text Capture in HyperTerminal to backup your Cisco IOS configuration



Posted by: David Davis
CCNA, Cisco

While you can download your Cisco IOS configuration using TFTP, this requires networking to be configured and operational. Another alternative is to use HyperTerminal's text capture to backup your configuration. Let's find out how... Here is how to use it, step by step: a. In the...


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