Friday, April 23, 2010

Extra long (shut up)

Well first let's start on my progress. I am on the second to last chapter. After I'm through with it I'm going to go back and reread and test the concepts I still need a better grasp of.

So back to what I'm learning. Certifier, checks to make sure your network follows standards, costs a lot of money. Time-Domain REFLECTOMETER! It sends a signal down the a copper wire and if there's any interruption in the signal some of it will reflect back to the TDR. This allows you to check like speed of the wire, how much lost and cable length. Optical Time-Domain REFLECTOMETER performs the same function as the TDR except it's meant for fiber cables so instead of electric pulses it uses light and instead of measuring a response it measures the amount of scattered light. NEW PARAGRAPH.

You all probably know what a multimeter is. It just measures voltage, current and resistance. A Toner Probe is a somewhat nifty device where you connect one probe to the end of a wire and then using the other probe you can find that same wire in a bundle of wires since it listens for the tone.

That was a bit of a boring post but don't worry! I have something else in store!.

Thursday, April 22, 2010

Network Analyzers

Yesterday I downloaded Wireshark. I've actually used it before once in conjunction with another little program... Anyways the reason I downloaded it was the book recommends it as a packet sniffer. One thing I forgot is you have to set your NIC into promiscuous mode which may require special drivers and running a packet sniffer on the school network may not be the best thing to do. So onto hardware testers.

A wire-map tester is one of the most basic cable testers you can buy. It just checks that the wires in a twisted-pair are in their correct places. It can also check for broken or unconnected wires. Surprisingly this basic tester starts at around 100 dollars.

A protocol analyzes, wait for it, protocols! They come in hardware and software forms. It allows you to troubleshoot problems on a network, doesn't really explain how..., gather traffic info, find unused protocols to remove from your network and traffic generating for penetration testing. And that's that for today.