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Note that this article was originally published at SearchNetworking.com. In our last article, we talked about the importance of static IP routing. Static routing still has an important place, but as a network administrator, you must also know dynamic IP routing like the back of your hand. In this article, we’ll explore dynamic IP routing and you’ll learn the practical information that you need to know about it. Checkout this Video series on the Cisco CCNA Certification!
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Category Archives: Cisco
PIX firewall configuration from scratch
In this tip, network engineers can learn how to configure a new PIX firewall, out of the box. You will configure passwords, IP addresses, network address translation (NAT) and basic firewall rules.
Binary-to-decimal conversion
Binary-to-decimal conversion
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To be a network engineer (especially a CCNA), you need to understand binary so that you can understand how a network device uses its IP address, subnet mask, and default gateway information. You also need to be able to convert from binary to decimal and from decimal to binary.
What is binary and how can it help you as a network engineer? Let’s find out…
How to download the Cisco IOS
Say that you buy a used Cisco router off of Ebay. It is running an older version of the Cisco IOS and you would like an upgrade to it.
First let me point out that, if you read the Cisco IOS licensing agreement, the Cisco IOS license is non-transferable. That means that, technically, the IOS software on the used Cisco router doesn’t belong to you at all. So, technically, you must buy a new IOS license to go with that used Cisco router. Not a lot of people do this because, many times, that IOS license actually costs more than the used router you just bought.
So what do you do?
Here are your options:
- Download the Cisco IOS from somewhere like a bittorrent or a file sharing program. ** I don’t recommend this option to anyone ** This is because this option is illegal. However, I mention it because I believe that many people do this, even though it is not right.
- Purchase a maintenance contract for the hardware and download the software. Technically, this is not legal either. To have a maintenance contract, you must also have bought an IOS license. However, many times, Cisco doesn’t stop you from doing this.
- Buy the IOS from a reseller, such as this version available from CDW and then you are completely legal. The cost of the software will vary based on the model of the router you are buying it for and the features of the OS you are wanting. Unfortunately, even if you spend over $1000, you still aren’t licensed for upgrades to this version of the IOS, even after buying it. To also be able to get upgrades when they are available, you must also buy maintenance on this router (Cisco calls it Smartnet).
You might have been looking for a link to just download the Cisco IOS for free. Unfortunately, I can’t offer that but I can offer you the right way to obtain the Cisco IOS and a lot of other free Cisco and Windows how-to advice.
RoutING vs RoutED protocols
It surprises me how many people don’t really know what a routing protocol is or does. There are those who also couldn’t tell you the difference between a routING protocol and a routED protocol. Can you tell me the difference between a routING protocol and a routED protocol? Read this story to learn more……..
Cisco Routing Quiz – Prep for your CCNA!
Are you preparing for the CCNA exam? Maybe you just want to test your knowledge of Routing protocols. This quiz will tell you if you are up to speed when it comes to TCP/IP routing protocols. Take a look!
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