From the category archives:

CCNA

How To Configure a Router-on-a-Stick

by The Network Technician

The example I am showing you was built using the RouterSim Network Visualizer. I’m doing this as part of my CCNA studies to get me familiar with configuring a router and switch together and also making sure computers on different subnets can actually communicate with each other. Here is the virtual hardware used in this [...]

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How To Install GNS3 in Ubuntu 9.04

by The Network Technician

As I am currently studying for my CCNA, I find it very helpful to be able to practice creating networks in a non-destructive environment. Thus, GNS3 provides that solution. At first it was a little difficult installing it because you simply can’t type in sudo apt-get install GNS3 That’s not even half of it. So [...]

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WAN Link Protocols

by The Network Technician

For the CCNA certification exam, there are WAN link protocols you need to be familiar with: HDLC, PPP, Frame Relay and Packet-Switching. HDLC or High-Level Data Link Control is a point-to-point link protocol. Checks to see if data passed through the link without any errors. Defines framing. Performs error detection. PPP or Point-To-Point protocol was [...]

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Ethernet Cables & Speeds

by The Network Technician

For the real world, every network technician should be familiar with networking cables and their speeds. Here’s a simple table: Speed is very important because when you’re connecting them to network hardware you must be aware of cable speeds while working within the IOS. It’s going to be important when you’re troubleshooting network connectivity. The [...]

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I Shall Knoweth Thy WAN Speeds

by The Network Technician

Here’s a quick rundown on the different WAN speeds used today. If you’re in the U.S. you’ll be working with speeds such as T1′s and T3′s or DS1′s and DS3′s. There’s not much to worry about with E1 and J1 because those are European and Japanese speeds. It’s good to know this in real world [...]

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Layers of the OSI Model

by The Network Technician

The OSI (Open Systems Interconnect) model is just that – a model. It’s kind of like a reference in which vendors go by for communications purposes. The OSI model should become your best friend because it is best used as a troubleshooting step. By memorizing the OSI model you’ll be able to quickly troubleshoot any [...]

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CCNA Brain Farts: All Possible Valid Networks

by The Network Technician

A new section of this blog will be the Brain Farts. A section dedicated to CCNA knowledge we should have memorized for the test. The CCNA will require you to memorize a lot of information. Some of the most basic, fundamental numbers you should have implanted in your brain are all the possible valid network [...]

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TCP/IP Model: Networking Basics

by The Network Technician

Part of the CCNA certification requires you to know the TCP/IP Model. TCP/IP stands for Transport Control Protocol/Internet Protocol The layers of the TCP/IP model are: The Application Layer The purpose of the Application layer is basically to operate the user initiated protocols such as FTP and SMTP. As compared to the OSI model, the [...]

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