Τεχνικός Υπολογιστών CompTIA A+

A cloud technology in which a provider can provide specific infrastructure devices, applications, servers, a place to test code, and so on.

A security strategy in which a network device is checked for certain parameters, such as operating system type, operating system revision number, and/or security software installed, before being allowed onto the network.

An SSD storage technique in which data is retained even when the device is not powered.

An easy-to-use Linux text editor.

A measurement of processor technology length equal to .000000001 meter (1 times 10–9). For example, chipsets created using 22 nm technology have more transistors in the same amount of space as chipsets created using 32 nm or 45 nm technology.

One-billionth of a second.

See network-attached storage device.

A drive used in a network-attached storage device that costs more than a drive of the same capacity used in a PC, for example, because a NAS drive is built to run 24/7.

A method of conserving public IP addresses. NAT uses private IP addresses that become translated to public IP addresses.

The number of pixels going across and down a flat panel monitor. This resolution is the specification for which the monitor was made and is the optimum resolution.

The default file manager for the GNOME desktop in Linux systems.

(NetBIOS over TCP/IP) Uses TCP ports 137–139 to support outdated applications that rely on the NetBIOS API to use a TCP/IP-based network. Also known as NetBT.

A command to view other network devices by their assigned names and display statistics relevant to current TCP/IP connections on the local computer or a remote computer using NBT.

From a prompt, the net command manages almost everything on a network. It is followed by other options, each of which has different parameters.

From a prompt, the net use command is used to map a network share to a drive letter or view mapped drives on a Microsoft-based machine.

From a prompt, the net user command is used to create, delete, or make changes to user accounts from a command prompt on a Microsoft-based machine.

An update to NetBIOS standard to allow communication on a network. A nonroutable network protocol found on peer-to-peer networks. Can work only on simple networks, not on linked networks.

An older method of providing name resolution and connectivity methods for both connectionless and connection-oriented communication sessions.

Uses TCP ports 137–139 to support outdated applications that rely on the NetBIOS API to use a TCP/IP-based network. Also known as NBT.

From a prompt, a command that can manage workstations in a domain environment.

A command that can view current network connections and the local routing table for a PC.

Two or more devices that can communicate and share resources between them.

Sometimes called a Preboot Execution Environment (PXE) boot, where the system boots from a server that deploys an operating system image to a computer.

See NIC.

Layer 3 of the OSI model, which coordinates data movement between two devices on separate networks.

The portion of an IP address that represents which network the computer is on.

A port that connects a computer to a wired network.

Enables network users to add the printer to their computer using the domain printer name or IP address.

A data communication language.

A folder or network device that has been shared and is accessible from a remote computer.

A type of IT documentation that shows how wired and wireless devices connect.

A special hardware component of virtualization to increase storage space that can be shared with other devices. Also see NAS drive.

A technology that connects nearby devices without a cord.

A wireless device used to securely authorize payment for a transaction.

An open standard protocol used for sharing files across a network.

A port on a device that allows connectivity to a network. A NIC can connect to a wired or wireless network.

A type of battery used in small devices such as mobile devices, tools, and video recorders.

A rechargeable type of battery.

A computer case form factor.

A protocol used to deliver news to network clients. Uses TCP port 119. If TLS (Transport Layer Security) is used, then the port number is commonly 563.

An issue that could be helped by turning the device off and back on, check for interference, ensure that Bluetooth is enabled, and enter passkeys/PINs.

An error condition that exists if the self-test issued from a computer fails.

With this problem on a mobile device, attach an external display if possible. If attached to a projector, check the output port chosen. Check the lid close detector. Turn the device off and back on. Charge the device fully.

In this situation, check that the printer is powered on, check the power outlet, and check the power brick.

In this situation, check power to the display, power to the computer, power to the video card, and power from the power supply, driver, and video cable.

A situation where the operating system is corrupt, there is a problem with the boot device such as the hard drive, or the BIOS/UEFI settings are incorrect.

In this situation, check that power cord is attached, the power button pushed, the surge strip turned on, and the monitor is turned on; could be an indication of a faulty power supply. On a mobile device, check brightness, lid close sensor, and battery. Check for malware.

In this situation, check for muted or low volume, correct sound output device, cabling, and speaker power.

In this situation, check whether WiFi is enabled and ensure that the device is not in Airplane Mode. Turn off WiFi and turn it back on again. Move the device to see if you have a higher signal strength (display on a laptop). Ensure that the correct wireless network is chosen.

A type of memory that does not do error correction. Most workstation memory is non-ECC memory.