CompTIA Tech+ (FC0-U71) flashcards

A performance metric that measures the number of discrete read and write operations a storage device or system can handle in one second.

• Crucial for transactional databases and virtualized environments.
• Higher IOPS generally means better performance for many small operations.
• Different for sequential vs. random I/O.

Memory trick: Speed is IOPS, capacity is GB, latency is fast, bandwidth is flow, power is W, clock is MHz. For databases, IOPS is the show!

Modern smartphone screens often integrate multiple components, including the display panel (LCD/OLED) for visuals and a digitizer for touch input, which can fail independently or as an assembly.

• LCD/OLED displays generate the visual output.
• Digitizers detect and interpret touch input.
• Failures can manifest as visual artifacts, unresponsiveness, or both depending on the component and integration.
• Many smartphones use integrated display assemblies where both are replaced together.

Memory trick: Visual problems point to the display, touch problems to the digitizer, but sometimes they're linked.

The range of positive and negative values that can be represented by a fixed number of bits, where one bit is reserved for the sign.

• One bit is for the sign (0 for positive, 1 for negative).
• Remaining bits represent the magnitude.
• Range: -(2^(n-1)) to (2^(n-1) - 1) for n bits.

Memory trick: Sign takes one bit, magnitude gets the rest, maximum is 2 to the power, then subtract one, for the best!

A common standard for wired networks that supports a theoretical maximum data transfer rate of 1 Gigabit per second.

• Also known as 1000BASE-T.
• Operates at 1 Gbps (1000 Mbps).
• Uses twisted-pair copper cabling (Cat5e or better).

Memory trick: Kilobit is thousand, Megabit million, Gigabit billion. Remember the 'Giga' for 1000 Mega!

An IP address that can be assigned to a device on a network, excluding the network address and broadcast address.

• Network address: all host bits are 0.
• Broadcast address: all host bits are 1.
• Host addresses fall between the network and broadcast addresses.

Memory trick: Network's house: first is zero, last is all. Live in between!