CompTIA A+ 1101 Notes

print spooler - software that stores print jobs and sends them to the printer.

What happens when the printer spooler stops working?

If the printer spooler has failed or has stopped, then none of the print jobs will be sent to the printer

PCL stands for Printer Command Language

Page description language configured in a printer driver must match the language on the printer

tone generator - used to produce an analog tone on the cable

inductive probe - used to “listen” for the tone on the other end of the cable

Port flapping - a network interface that constantly transitions between connected and disconnected. issue can be caused by a software or firmware issue, but most likely associated with a hardware issue.

A swollen battery means damage to the battery, and could potentially cause a fire hazard

Inverter - powers the CCFL (Cold Cathode Fluorescent Lamp) LCD (Liquid Crystal Display) backlight, allowing you to see the pixels on the screen.

Most newer laptops use LED (Light Emitting Diode) backlights with existing DC(Direct Current) power. LEDs don’t need an inverter

An optical disc has the advantage of large storage area and the ability to write once and never worry about an accidental deletion

the POST (Power On SelfTest) is the initial hardware check during the startup process

Port 443 - commonly used by web browsers to transfer information using SSL or TLS ecryption protocols

Port 22 - used by SSH as encrypted terminal communication

SSH is commonly used to access the command line terminal of remote devices and servers

Port 23 - used by Telnet for non-encrypted terminal communication between devices

flickering and poor video quality would usually mean there’s an issue with the connection between the video adpater and the display device.

Digitizer - component in a touch screen to convert analog input from a fingerprint or stylus into a digital input

Duplex setting - prints output on both sides of the page

Orientation - changes the output between portrait or landscape on a printer

Resolution - modifies the number of dots per inch used for the output on a printer.

RAID 1 - a mirrored array, which means all information on one physical drive is also copied and maintained on a separate device. If one drive fails, the drive with the redundant data continues to be available

To repair a RAID 1 array, the bad drive needs to be replaced and the data from the redundant drive synchronized to the new drive

If voltage specifications are wrong in another country, it can cause server damage, or the server may not work at all.

Port 110 - default port for POP3

POP3 - commonly used to retrieve email messages from an email server to a local email client application

Port 25 - email protocol with SMTP, sends mail to a mail server and to transfer email messages between mail servers

Port 23 - non-encrypted (in-the-clear) terminal communication with Telnet protocol

Port 35 - default port for DNS.

Crimper - tool that is used to attach a modular connector to a cable

SMB is the protocol used by Microsoft operating systems to share files, print jobs, and other info between other Microsoft OS devices.

collision - conflicting signals trying to communicate at the same time

DHCP server - automatically assigns IP addresses to devices on the network from an available pool.

Punch-down tool - used to firmly “punch” a wire into a wiring block

if DHCP isn’t responding, the local worksation will configure with APIPA (Automatic Private IP Addressing)

An APIPA address is a link-local address, so network communication is limited to the local IP subnet.

Subnet masks - Series of binary ones that are used to “mask” the subnet address from the host address, and determines what subnet it’s connected to.

PAN (Personal Area Network) - designed for a small area and usually is associated with an individual. (bluetooth devices, speakers, etc)

WAN (Wide Area Network) - A network link between cities, states, or countries