Wednesday, December 8, 2010

End of Hardware

In the chapter it talks quite a bit about the Point to Point Protocol. Using it's examples if you want to make a PPP link you would use a script that looks like.

chat " " ATZ OK ATDT5558080 CONNECT " " login: username word: password Mind you this is all about modems which is pretty much irrelevant these days but I'm assuming that they want us to know this...

Chat wakes up the modem, ATZ resets it, ATDT and CONNECT dial the number and then the login and password prompts are used for logging in.

Still not done. After that you must establish networking (chat just opens up the connection) by using pppd (point to point daemon). Another example.

pppd /dev/cua1 57600 crtscts defaultroute

ppd /dev/cua1 changes the interface over to a PPP connection and sets up networking. 57600 specifies the estimated speed and no that is not kilobytes, it's baud. crtscts performs a "handshake" and defaultroute sets the default gateway to the remote machine's IP. I obviously couldn't test any of this like the previous commands so I'm just going to have to go with their word.

Apparently the LPIC assumes you have servers with SCSI so...

The SCSI bus type determines the density of the devices so 8-bit SCSI is eight devices and 16-bit 16 devices. The number that you associate (1 -7 or 1-15) determines the priority it gets accessing the SCSI bus. Usually the highest number is the highest priority.

Any info on SCSI devices on your machine can be found in /proc/scsi/scsi and then the chapter abruptly ends. I took the exam after that and got an 8/10 which I think is pretty good.

1 comment:

  1. As you know, you are studying a technology no longer in common use. That's one of the drawbacks of any kind of standardized test in a field that changes as fast as this one - the evaluations are antiquated almost from the moment they are released.