CompTIA A+ 220-801 Memory Questions

ECC stands for Error Correcting Code. This term refers to a coding technique used in computer systems to detect and correct errors that occur during data transmission or storage. By adding extra bits to the transmitted data, ECC allows the receiver to identify and fix errors, ensuring data integrity. This is particularly important in critical applications where even minor errors can have significant consequences, such as in memory systems or communication protocols.

DDR2 and DDR3 memory modules have 240 pins. The number of pins on a memory module determines the type and compatibility of the memory with the motherboard. DDR2 and DDR3 modules both have 240 pins, which means they are not interchangeable. This information is important when selecting and installing memory modules to ensure compatibility with the motherboard.

DIMM stands for Dual Inline Memory Module. This is a type of computer memory module that is used in desktop computers and servers. It is a circuit board that contains memory chips and connects to the computer's motherboard. The term "dual inline" refers to the fact that the module has two sets of electrical contacts on each side, allowing it to be plugged into the motherboard. DIMMs are commonly used for RAM (Random Access Memory) in computers, providing a high-speed data storage and retrieval solution.

DDR2 memory modules do not fit into DDR3 memory slots because they have different physical designs and pin configurations. DDR2 modules have 240 pins, while DDR3 modules have 240 or 204 pins, depending on the type. Additionally, DDR2 and DDR3 modules have different notches on the connectors, preventing them from being inserted into the wrong type of slot. Therefore, DDR2 memory modules are not compatible with DDR3 memory slots.

SIMM stands for Single Inline Memory Module. This type of memory module was commonly used in older computer systems. It consists of a single row of memory chips that are soldered onto a circuit board. The SIMM module is inserted into a memory slot on the computer's motherboard. It is called "single inline" because all of the memory chips are arranged in a single row, rather than being spread out across multiple rows. SIMM modules have been largely replaced by newer technologies such as DIMM (Dual Inline Memory Module) and SODIMM (Small Outline Dual Inline Memory Module).

A DDR1 desktop memory module has 184 pins.

Ethernet cables (typically Cat5e or Cat6) are the most common type used to connect a PC to a wired network. They are responsible for carrying network signals between devices like computers, routers, and switches. HDMI is used for video/audio output, VGA is for video display, and USB is primarily for data transfer or connecting peripherals. Ethernet, on the other hand, provides reliable, high-speed communication for network connections, making it the standard for wired network connectivity.

CRIMMs (Continuity RIMMs) are used with RDRAM (Rambus Dynamic Random Access Memory) technology to terminate the memory bus. RDRAM requires CRIMMs to be installed in empty memory slots to ensure proper termination of the bus, preventing signal reflections and maintaining signal integrity. Therefore, the correct answer is "RDRAM to terminate."

The PC speed rating for DDR memory modules is calculated by multiplying the DDR I/O speed by 8. In this case, the DDR3 I/O speed is 800 MHz. Multiplying 800 MHz by 8 gives a data rate of 6400 MB/s, resulting in the PC3-6400 speed rating. Other options like PC3-12800 and PC3-17000 correspond to higher data rates, which are derived from faster DDR I/O speeds, but for 800 MHz, the correct speed rating is PC3-6400.

The DDR2 Speed Rating of DDR2-1000 indicates that the memory module can transfer data at a rate of 1000 million transfers per second. The Core RAM Clock Speed, on the other hand, refers to the speed at which the memory module's internal clock operates. In the case of this question, the Core RAM Clock Speed would be one-fourth (or 25%) of the DDR2 Speed Rating, resulting in a clock speed of 250 million cycles per second.

CAS, or Column Access Strobe, refers to a signal used in DRAM (Dynamic Random-Access Memory) to access the data stored in the memory cells. When reading or writing data, the CAS signal is used to identify the specific column in the memory array where the data is located. This term is important in understanding memory timings, such as CAS latency, which affects the performance of RAM in a computer system.

A RAMBUS or RIMM memory module typically has 184 pins.

The technology to detect memory automatically in the motherboard is called SPD (Serial Presence Detect). This technology allows the motherboard to identify and configure the memory modules installed in the system without manual intervention. It provides information about the memory module's capacity, speed, timings, and voltage requirements, allowing the motherboard to optimize its settings accordingly. This ensures compatibility and optimal performance of the memory modules in the system.

Laptop memory modules come in various sizes, including 72, 144, 200, and 204. These numbers represent the number of pins on the memory module. Different laptops require different sizes of memory modules, so it is important to choose the correct size when upgrading or replacing memory in a laptop. The other options, 68 and 168, are not mentioned as common sizes for laptop memory modules.