Computer Science Questions
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The major operating system services provide mechanisms for secure and efficient are: *1/1Communication between processesAll of the other choicesExecution of a program, I/O operations performed by it, and detecting and reporting errors caused by itFile manipulation
The ways that input/output can be done is? *DMA (Direct Memory Access)All of the other choicesBusy waitingInterrupt
Information that must be saved prior to the processor transferring control to the interrupt handler routine includes: *0/1PSWNone of the other choicesPSW and Contents of processor registersPSW and PC
The main characteristics of layered system does not include: *A. Upper layer can only call functions of closely lower layer B. Each layer has well defined functionsC. Each layer runs independentlyD. Many layers
Which of the following statements about the CPU's handling interrupts is incorrect? *None of the other choicesThe CPU branches to a new instruction sequenceThe hardware saves the old PC locationThe processor ceases to execute the current sequence of instructions
Which of special register contains the Mode Bit (user or kernel)? *1/1Program Counter (PC)None of the other choicesProgram Status Word (PSW)Instruction Register (IR)
Which is not an example of a resource that is commonly time-multiplexed? *1/1CPUGraphics acceleratorMain memoryNetwork interface
List of memory location, that contains the executable program, the program's data, and its stack is called: *0/1set of resourcesall of the other choices address memoryaddress space
____ is the partitioning of a single server, each of which can support a different operating *MultiprocessingMultithreadingShared processingVirtualization
Consider a computer system that has cache memory, main memory (RAM) and disk, and OS uses virtual memory. It takes 2 nsec to access a word from the cache, 10 nsec to access a word from RAM, and 10 msec to access a word from the disk. If the cache hit rate is 95% and main memory hit rate is 99%, what is average time to access a word? *1/15,000.495 nsec5,001.9 nsec2.395 nsec5,002.395 nsec
In CRC, if the generator is x^4+x+1, then which one is added in to the frame before dividing A. 1 1 1 1 1B. 0 0 0 0C. 1 1 1 1D. 0 0 0 0 0
Which of the following is not a step in the boot process? *1/1The BIOS is activated by powering on the CPUConfiguration and customization settings are checkedThe antivirus program checks all files for viruses The operating system is loaded into RAM
As one proceeds down the memory hierarchy (from inboard memory to offline storage), which of the following conditions is correct? *1/1Decreasing capacityNone of the other choicesIncreasing cost per bitIncreasing access time
A three-character data frame: A FLAG B when framing methods using byte stuffing. the output will beA. A FLAG FLAG BB. AB FLAG FLAGC. A ESC FLAG BD. AB ESC FLAG
A CPU may have multiple execution units, so that can carry out multiple instructions in the same time is called: *0/1None of the other choicesMulticore PipelineSuperscalar
Booting a general purpose computer involves the following steps except *a. Loading the OSb. Loading the command interpreter c. Loading one or more bootstrap loadersd. Execution of a ROM-based POST sequence
This command identifies the sender of the message.A. RCPT TOB. HELOC. MAIL FROMD. none of them
Which part of the mail created by the UA(User Agent) contains the sender and receiver names?A. envelope B. addressC. headerD. none of theme
What is the service that the UDP protocol provides ?A. Error detection B. Flow controlC. None is correctD. Guaranteed delivery
What does that mean by Carrier Sense in CSMA/CD (Carrier Sense Multiple Access/Collision Detection)?A. The station listens for the carrier signal before any transmissionB. The station waits for carrier signal arrive before any transmissionC. None of them D. Both of them