Comptia A+ Memory

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Author:
Techmus
ID:
65475
Filename:
Comptia A+ Memory
Updated:
2011-02-15 09:28:57
Tags:
RAM dimm sdram sram dram edo l1cache ddr simm
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learn memory module
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  1. Which of the following types of memory is used for cache memory,

    A @ DRAM
    B @ SRAM
    C @ EDO RAM
    D @ SDRAM
    B. SRAM is used for cache memory

    DRAM known as system memory stores data and program code that are running.

    EDO and SDRAM are types of DRAM
  2. How many bits make up the data path of a 30 pin SIMM,

    A @ 32
    B @ 8
    C @ 64
    D @ 12
    B. A 30 pin Simm has an 8bit data path

    72 pin SIMMs have a 32bit data path

    A DIMM has a 64bit data path
  3. Which type of cache memory resides on the system board,

    A @ DDR
    B @ L1 Cache
    C @ SDRAM
    D @ L2 Cache
    D. L2 cache memory is external to the CPU.This is the memory inserted onto the system board as additional cache memory.

    L1 cache memory is integrated into the CPU.
  4. Which type of memory must be constantly refreshed,

    A @ SRAM
    B @ DRAM
    C @ VRAM
    D @ L1 Cache
    B. DRAM must be constantly refreshed.

    Other types of memory do have to be refreshed but not as often as DRAM.
  5. Which type of memory is dual ported as in can read from and written to at the same time,

    A @ DRAM
    B @ VRAM
    C @ SRAM
    D @ L1 Cache
    B. VRAM, or video RAM, is dual ported memory that can read from and written to at the same time.Because of the performance increase with this type of memory, it is desired memory for video accelerator cards.

    The other types of memory are singel ported, which means that you have to read and write through the same port and can only go one way at a time.As a result , the memory is slower than VRAM.
  6. Which is the fastest memory of the following,

    A @ 120 ns
    B @ 30 ns
    C @ 10 ns
    D @ 70 ns
    C. With nanoseconds (ns) the lower the number, the faster.Because it is measured in billionths of a second and determines how long it takes the system to access the information stored in memory, 10 ns is faster than the other choices.
  7. How many 72 pin SIMMs make up a memory bank on a Pentium system,

    A @ 1
    B @ 3
    C @ 2
    D @ 4
    C. 72 pin SIMMs are 32 bit modules.Because Pentium processors have a 64 bit data path, you need two 72 pin SIMMS to fill the data path.
  8. How many pins does a DIMM have,
    (Select all that apply)

    A @ 128
    B @ 64
    C @ 168
    D @ 32
    E @ 184
    F @ 196
    G @ 240
    • C.E.G. DIMMs come in different flavors;
    • 168 pin for SDRAM
    • 184 pin for DDR
    • 240 pin for DDR2 and DDR3

    The other choices for this question are just common numbers used in the computer field, but there are no memory modules that use those numbers of pins.
  9. How many bits of parity information are found in a 72 pin SIMM,

    A @ 2
    B @ 1
    C @ 3
    D @ 4
    D. There is always 1 parity bit for every 8 bits of data.A 72 pin SIMM is a 32bit module and is made up of four 8bit chunks, so it will have 4 parity bits.
  10. If memory data is corrupted, what type of error is created,

    A @ File access error
    B @ Parity error
    C @ DRAM error
    D @ Disk error
    B. You will receive a parity error if there are any problems with data stored in memory.
  11. When installing SIMM memory, what do you look for to identify Pin 1 on the memory module,

    A @ Red ribbon wire
    B @ SIMM cutout
    C @ Square solders
    D @ Blue ribbon wire
    B. When you look at the memory module you will notice that one side of the module is cut out.This indicates where pin1 is located on the module.

    There are no ribbon wires on a memory module.
  12. Which of the following best describes VRAM,

    A @ Memory that has video instructions burned to it by the manufacturer and that cannot be changed

    B @ Memory stored in the CPU and used for storing frequently used instructions

    C @ Dual ported memory usually found on video accelerator cards

    D @ Memory that has video instructions burned to it by the manufacturer and that can be reprogrammed only by using special software
    C. VRAM is dual ported video RAM, meaning that the memory can be written to on one port and read from on another port that is usually found on Video accelerator cards.
  13. What type of memory is typically used for storing computer BIOS code,

    A @ SRAM
    B @ DRAM
    C @ ROM
    D @ RAM
    C. A computer manufacturers BIOS code is typically stored on read only memory (ROM).

    Todays version of the BIOS chip can be reprogrammed by running special software to update the BIOS.
  14. Which of the following best describes shadow RAM,

    A @ An area of system memory that stores the information twice so that if the system crashes there will be a backup copy

    B @ An area of system memory where some of the BIOS functions are copied during the boot process

    C @ The same thing a SRAM

    D @ The process of having frequently used data stored in cache for quicker access
    B. The term shadowing implies making a copy -more specifically, copying the BIOS instructions to system memory so that the functions can be executed more quickly.
  15. How many 30 pin SIMMs are required to fill a memory bank on an 80486 processor,

    A @ 2
    B @ 1
    C @ 3
    D @ 4
    D.It takes four 30pin SIMMs to fill a bank in any 486 Processor because 30pin SIMMs are only 8bits wide, and a 486 processors data path is 32bit.

    A memory banks data path should be the same as a processors data path.

    If the SIMMs had 72 pins, you would need only one module because 72 pin SIMMs have a 32 bit data path, the same as a 486 chip.
  16. Which type of DRAM is synchronized with the system clock,

    A @ BEDO
    B @ EDO
    C @ FPM
    D @ SDRAM
    D. SDRAM memory is synchronized with the system clock speed.

    If the motherboard runs at 100 MHz,you must buy the same speed memory for the board.
  17. How many DIMMs are used to fill a memory bank in a Pentium lll system,

    A @ 2
    B @ 1
    C @ 4
    D @ 3
    B. Pentium llls have 64 bit data paths, and a DIMM has a 64bit data path as well.

    So you only need one Dimm chip to fill a bank in a Pentium system.
  18. When a CPU needs to access data, where will it look for the data first,

    A @ RAM
    B @ L2 Cache
    C @ ROM
    D @ L1 Cache
    D. The CPU checks the L1 cache first because it is SRAM memory integrated into the chip and has no wait time.

    If the data is not in the L1 cache the system checks the L2 cache, which is memory located outside the chip, usually on the motherboard.

    If the data is not in the L2 cache, the CPU checks in the RAM.

    If the data is not found in RAM, it is then read from disk.
  19. Which of the following best describes odd parity memory,

    A @ All data stored in memory is added; the answer is then stored in the parity bit

    B @ When a byte of data is stored, the values of all bits in the byte are added; if the number is even, the parity bit is enabled to create an odd number.If all bits in the data byte total an odd number, the parity bit is turned off, leaving the total an odd number

    C @ When a byte of data is stored, the values of all bits in the byte are added;if the number is odd, the parity bit is enabled to create an even number.If all bits in the data byte total an even number, the parity bit is turned off, leaving the total an even number

    D @ Every 8 bits of data are added, and the total is stored in the parity bit for that particular 8 bits of data
    B. Odd Parity memory stores a parity bit for every byte of data.

    The Parity bit is enabled if the data bits total an even number.

    The Parity bit is disabled if the data bits total an odd number.

    • Enabled = (set to 1)
    • Disabled = (set to 0)
  20. What is the purpose of CMOS RAM,

    A @ CMOS RAM is memory used to store the CMOS information.CMOS RAM maintains its information by using a battery found on the motherboard.

    B @ On system boot, the contents of the BIOS are copied to faster CMOS RAM.

    C @ CMOS RAM is the amount of memory that is regeistered into CMOS.

    D @ CMOS RAM is read only memory that stores CMOS information.
    A. CMOS RAM is a small amount of memory that maintains the CMOS configuration information.

    Because the information is stored in this type of RAM the memory has to have constant power which comes from the battery found on the motherboard.
  21. Steve adds a second 1Gb 240-pin DIMM to his PC, which should bring the total RAM in the system up to 2Gb.The PC has an Intel Core 2 Duo 3-GHz processor and three 240-pin DIMM slots on the motherboard.When he turns on the PC, however, only 1Gb of RAM shows up during the RAM count.Which of the following is most likely to be the problem?

    A @ Steve failed to seat the RAM properly.
    B @ Steve put DDR SDRAM in DDR 2 slot.
    C @ The CPU cannot handle 2 Gb of RAM.
    D @ The motherboard can use only one RAM slot at a time.
    A. Steve failed to seat the RAM properly.
  22. Scott wants to add 512 Mb of PC100 SDRAM to an aging but still useful desk-top system.The system has a 100-MHz motherboard and currently has 256 Mb of non-ECC SDRAM in the system.What else does he need to know before installing ?

    A @ What speed of RAM does he need?
    B @ What type of RAM does he need?
    C @ How many pins does the RAM have?
    D @ Can the system handle that much RAM?
    D. Scott needs to know if the system can handle that much RAM.
  23. What is the primary reason that DDR2 RAM is faster that DDR RAM?

    A @ The core speed of the RAM chips is faster.
    B @ The input/output speed of the RAM is faster.
    C @ DDR RAM is single-channel and DDR2 RAM is dual-channel.
    D @ DDR RAM uses 184-pin DIMMs and DDR2 uses 240-pin DIMMs.
    B. The input/output speed of DDR2 RAM is faster than DDR RAM ( although the latency is higher).
  24. What is the term for the delay in the RAMs reponse to a request from the MCC?

    A @ Variance
    B @ MCC gap
    C @ Latency
    D @ Fetch interval
    C. Latency is the term for the delay in the RAMs response to a request from the MCC.
  25. Dolly has a motherboard with four RAM slots that doesn't seem to work.She has two RDRAM RIMMs installed, for a total of 1GB of memory, but the system will not boot.What is likely to be the problem?

    A @ The motherboard requires SDRAM, not RDRAM.
    B @ The motherboard requires DDR SDRAM, not RDRAM.
    C @ The motherboard requires all four slots filled with RDRAM.
    D @ The motherboard requires the two empty slots to be filled with CRiMMs for termination.
    D. RDRAM-based motherboards require empty slots to be filled with CRIMMs for termination.
  26. Elvis has an AMD -based motherboard with two sticks of DDR2 RAM installed in two of the three RAM slots, for a total of 2Gb of system memory.When he runs CPU-Z test programe to test the system,
    he notices that the software claims he's running single-channel memory.What could be the problem?(choose the best answer)

    A @ His motherboard only supports single-channel memory.
    B @ His motherboard only supports dual-channel memory with DDR RAM, not DDR2.
    C @ He needs to install a third RAM stick to enable dual-channel memory.
    D @ He needs to move one of the installed sticks to a different slot to activate dual-channel memory.
    • D. Motherboards can be tricky and require you to install RAM in proper slots to enable dual-channel memory access.In this case, Elvis should move one of the installed sticks to a different slot to activate dual -channel memory.
    • (And he should check the motherboard manual for the proper slots).
  27. Motherboards that support more than four sticks of RAM may require what to function properly?

    A @ Buffered RAM
    B @ ECC RAM
    C @ Dual-channel RAM
    D @ DDR2 RAM
    A. Motherboards that support more than four sticks of RAM may require buffered RAM to function properly.
  28. What is the best way to determine the total capacity and specific type of RAM your system can handle?

    A @ Check the motherboard book.
    B @ Open the case and inspect the RAM.
    C @ Check the Device Manager.
    D @ Check the System utility in the Control Panel.
    A. The best way to determine the total capacity and specific type RAM your system can handle is to check the motherboard book.
  29. Obama installed a third stick of known -good RAM into his Core i7 system, bringing the total amount of RAM up to 3GB.Within a few days, though, he started having random lockups and reboots, especially when doing memory intensive tasks such gaming.What is likely the problem?

    A @ Obama installed DDR RAM into a DDR2 system.
    B @ Obama installed DDR2 RAM into a DDR3 system.
    C @ Obama installed RAM that didn't match the speed or quality of the RAM in the system.
    D @ Obama installed RAM that exceeded the speed of the RAM in the System.
    C. Most likely, Obama installed RAM that did not match the speed or quality of the RAM in the system.
  30. Oprah installs a second stick of DDR2 RAM into her Core 2 Duo system,bringing the total system memory up to 2GB.Within a short period of time, though, she begins experiencing Blue Screens of Death.What could the problem be?

    A @ She installed faulty RAM.
    B @ The motherboard could only handle 1GB of RAM.
    C @ The motherboard needed dual channel RAM.
    D @ There is no problem.Windows always does this initially, but gets better after crashing a few times.
    A. If you have no problems with a system and then experience problems after installing something new, chances are the something new is at fault.

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