Weakpoints Flashcards
What are Thermal printers and what are they used for?
For receipts usually.
Heats the paper to turn it black.
Feed assembly pushes paper along.
Cheap, and silent.
Describe Inkjet printers are their uses.
Expensive ink.
Good quality print.
Ink fades over time.
Most common at the home.
Uses ink cartridges CMYK.
Can print duplex/both sides.
Has a print head, paper feeder, circuit board, belt, power supply, and the case.
Colour and things can be calibrated.
Describe a Laser printer.
Laser fries image onto the drum, then the toner is put on there for the picture.
Transfer belt and roller for colour
cyan, magenta, yellow and black.
Complex with lots of parts.
High quality and can print much faster than inkjet printers can.
Most are equipped with high-capacity paper trays, so they can print more pages at a given time.
They’re also built to handle the printing of thousands of pages per month without succumbing to wear-and-tear.
Laser printers can’t handle a variety of paper or printing materials like inkjets. Anything heat-sensitive cannot be run through them. Home laser printers can handle simple graphics, but smooth photographs are a challenge. If you want to print photos, go for inkjet.
Although toner drums in a laser printer are more expensive to replace than inkjet ink cartridges, they last longer and will require less frequent replacements, which will generally lead to a lower cost per page.
Describe Impact printers.
An impact printer is a type of printer that works by direct contact of an ink ribbon with paper. A metal or plastic head strikes the ink ribbon, whereby the ribbon is pressed against the paper and the desired character (letter, digit, dot, line) impression is printed on the sheet.
Typewriters.
How to troubleshoot if your printer is:
- ghosting
- lines in the image
- smudged images
- blank pages
- speckled pages
Ghosting: Adjust the paper setting – If you are using a specific type of paper, like laser printer paper, make sure that the paper setting matches the paper type. Usually a quick paper setting adjustment will clear up a ghosting issue right away. Run a cleaning – Most printers have a cleaning function built into the machine.
Lines in the image: You may be running out of ink or toner. Check your ink or toner supply and buy a new cartridge if necessary. The print cartridge could be the reason. When the print cartridge is not being effectively cleaned off, it creates streaks or shading on the document.
Smudged images: the print cartridge could be the reason. When the print cartridge is not being effectively cleaned off, it creates streaks or shading on the document. Replace it, clean it, check paper is not damp or wrong.
Blank pages: Clean the print head, if necessary. Make sure the paper size, orientation, and layout settings in your printer software are correct. Make sure your document does not contain blank pages. If your printer software has a Preview option, you can check for blank pages before you print and remove them, if necessary.
Speckled pages: typically caused by foreign material inside the machine (for example paper dust, glue from labels or envelopes, paper clips, staples) sticking to or damaging the surface of the drum. Toner builds up on or sticks to these areas on the drum and creates black dots on the printed pages.
What are 3D printers and what can they do?
Uses filament or resin.
Resin is SLA printing with smooth
and fine details.
The resin is hardened using a laser.
Uses a print head, a nozzle.
Filament printing. Melts filament to print 3D objects.
Takes a long time to print. USB can be connected to it with data for object.
What is SSH and what does it do?
SSH or Secure Shell is a network communication protocol that enables two computers to communicate (c.f http or hypertext transfer protocol, which is the protocol used to transfer hypertext such as web pages) and share data.
The Secure Shell Protocol (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network.
System admins use SSH utilities to manage machines, copy, or move files between systems. Because SSH transmits data over encrypted channels, security is at a high level.
What is SMTP and what does it do?
Simple Mail Transfer Protocol (STMP)
SMTP is used to send and receive email. It is sometimes paired with IMAP or POP3 (for example, by a user-level application), which handles the retrieval of messages, while SMTP primarily sends messages to a server for forwarding.
What is IMAP and what does it do?
IMAP (Internet Messaging Access Protocol).
Streams email from a server.
Users can log in via multiple email clients on computers or mobile device and read the same messages.
All changes made in the mailbox will be synced across multiple devices and messages will only be removed from the server if the user deletes the email.
What ports and protocols do you need to setup secure email?
SMTP should instead use port 587 — this is the port for encrypted email transmissions using SMTP Secure (SMTPS).
SMTP (sending mail) Encrypted - SSL - 465.
IMAP (receiving mail) Encrypted - TLS - 993.
POP3 (receiving mail) Encrypted - SSL - 995.
What are hypervisors?
Software.
Examples of Type 1 hypervisors are: VMware ESXi and Microsoft Hyper-V, while Type 2 hypervisors are: Oracle VirtualBox and VMware Workstation.
A hypervisor allows one host
computer to support multiple
guest VMs by virtually sharing its
resources, such as memory and
processing.
A hypervisor, also known as a virtual machine monitor or VMM, is software that creates and runs virtual machines (VMs).
What are type 1 hypervisors and what are they used for?
VM.
Type 1 Native/Bare Metal
Hypervisor: This is also known as
Bare Metal or Embedded or Native
Hypervisor.
Runs directly on the underlying computer’s physical hardware, interacting directly with its CPU, memory, and physical storage. For this reason, Type 1 hypervisors are also referred to as bare-metal hypervisors. A Type 1 hypervisor takes the place of the host operating system.
What are type 2 hypervisors and what are they used for?
Type 2 Hosted Hypervisor: also
known as Hosted Hypervisor. the
hypervisor is installed on an
operating system and then
supports other operating systems
above it.
A type 2 hypervisor is hosted, running as software on the O/S, which in turn runs on the physical hardware. This form of hypervisor is typically used to run multiple operating systems on one personal computer, such as to enable the user to boot into either Windows or Linux.
What is the fastest and slowest Cat types?
Slowest: Cat 5.
Fastest: Cat 8.
What are Cat cables used for?
“Cat” cables, short for “category”, are used to connect computer network devices such as modems, routers, computers, servers and switches. They are also called network, LAN or Ethernet cables.
Cat5 - Cat8.
Ethernet cables.
T568A (A wiring) and T568B (B wiring).
What are the languages for printers?
PostScript, PCL, DVI, PDF.
Printing languages, also sometimes called page description languages, are representations of exactly what needs to be on the screen or printed page.
What are key ways to reduce printer jams?
Use the paper guides.
Use the correct paper.
Clean the printer’s rollers.
Do not use damaged paper in your printer.
Do not overfill the print tray, or let the end tray become overfilled.
Do not mix paper types in the printer’s input tray.
What does a wire crimper do?
Used to crimp the connectors with
LAN cables.
Used to deform the material and
create the connection. Crimping is
commonly used in electrical work,
to attach wires together or wire to
other connectors.
Connects wires.
What does a toner probe do?
For finding electrical cables such as
Internet cables, phone lines,
speaker wires, and ethernet wires
in a house or building.
Find cables by tracing electrical
signals back to their sources.
Toner probes are used to trace cables between rooms in a building. One part of the toner probe creates a tone that is placed onto a wire. The other part has a speaker to play the tone when touched to the other end of the wire.
Basically to find a wire amongst hundreds.
Verify cable continuity, identify wiring faults, determine line polarity and voltage in network (Cat 5 and Coax) and modular telephone lines.
What does a WiFi analyser do?
WiFi Analyzer can help you to
identify Wi-Fi problems, find the
best channel or the best place for
your router/access-point by turning
your PC/laptop, tablet or mobile
device into an analyzer for your
wireless network.
Optimises your network.
What does a cable stripper do?
Removes the insulation from
electric wires.
A wire stripper is a portable handheld tool used by workers, especially electricians, for removing the protective coating of an electric wire in order to replace or repair the wire.
It is also capable of stripping the end portions of an electric wire in order to connect them to other wires or to terminals.
What does a punch down block do?
Used to connect
telecommunications and network
wires to a patch panel.
For inserting wire into insulation-displacement
connectors on punch
down blocks, patch panels.
RJ-45’s etc.
What does a cable tester do?
Verify the electrical connections in
a signal cable or other wired
assembly.
The tester is an electrical device
which measures the conductance
between two ends of a cable and
checks and measures the signal it
finds for the correct wiring.
Tests if the cable is good or not
and paired correctly and so on
What the broadband guy used for
the WiFi.
What does a loopback plug do?
A device used to test ports (such as
serial, parallel USB and network
ports) to identify network and
network interface card (NIC) issues.
For issues with NIC cards in a
computer.
When a port might not be working.
Loopback plug equipment facilitates the testing of simple networking issues and is available at very low costs.
What does a network tap do?
A network tap is a system that
monitors events on a local network
Piece of hardware that allows the
monitoring of a computer network
line.
Connects directly to the cabling
infrastructure to split or copy
packets for use in analysis, security
or general network management.
What is the port for DNS and what does it do?
DNS uses Port 53 which is nearly always open on systems, firewalls, and clients to transmit DNS queries.
A DNS port is the port that DNS servers assign, and the most frequently used port for this purpose is UDP 53. This is a default port for all queries and zone transfers with better speed and performance, and it will help establish communication between computers without using IP addresses
DNS, or the Domain Name System, translates human readable domain names (for example, www.amazon.com) to machine readable IP addresses (for example, 192.0.2.44).
What is the port for Telnet and what does it do?
Telnet commonly provides remote access to a variety of communications systems. Telnet is also often used for remote maintenance of many networking communications devices including routers and switches.
Telnet uses the TCP port protocol and port 23 to establish a connection with remote computers. The created system acts as a Telnet server and is available to receive commands.
Virtually access a computer and to provide a two-way, collaborative and text-based communication channel between two machines.
