A+ Certification, awarded by CompTIA® organization is the most widely recognized certification in the area of PC hardware and software technologies. To attain A+ certification, one need to pass 2 exams, namely, A+ Core Hardware Technologies, and A+ Operating Systems Technologies. These exams basically test the skills in assembling a computer, troubleshooting, and the ability to work with various operating systems. Linux is not included in the A+ Certification Operating Systems exam, as it has an exam of its own (Linux+ Certification), offered by CompTIA. The exam cram offers several final preparation points for candidates intending to appear for the A+ test. Latest objectives are available from Comptia.com website.
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21. Most commonly used modem commands:
The following are most commonly used modem commands:
Modem commands-Command function
- ATA- Answer the phone
- ATD-Dial the phone, ATDT for Tone dialing, ATDP for Pulse dialing
- ATH-Hang up
- AT&F-Reset modem parameters and settings to factory defaults
- AT&W- Write the current parameter values and settings
22. General PC error codes and probable causes:
100-199 : System board failures200-299 : Memory failures 300-399 : Key board failures 400-499 : Monochrome video problems 500-599 : Color video problems 600-699 : Floppy disk errors 1700-1799: Hard disk problems.
Some of the frequently encountered error codes and their corresponding error messages are given below: