chapter7 and 8

access control list

A(n) ____ contains a list of files, each of which is associated with the names of users who are allowed to access it and the type of access each user is permitted. a. access control matrix c. capability list b. access control list d. capability matrix

relative

A(n) ____ filename is the name that differentiates a file from other files in the same directory. a. absolute c. short-form b. relative d. directory

Megabytes

The data-transfer rate for an optical disc is measured in ____ per second and refers to the speed at which massive amounts of data can be read from the disc. a. kilobytes c. gigabytes b. megabytes d. terabytes

CBA = (RN - 1) * RL

The formula for computing the current byte address (CBA) for a direct access file with fixed record length is ____. a. CBA = (RN - 1) * RL c. CBA = RN / RL b. CBA = RN * RL d. CBA = (RN + 1) * RL

Density

The number of characters that can be recorded per inch on a magnetic tape is determined by the ____ of the tape. a. width c. density b. length d. parity

13

A dual-layer, single-sided DVD can hold the equivalent of ____ CDs. a. 3 c. 13 b. 8 d. 19

ordinary file

A file containing data or programs belonging to users is known as a(n) ____. a. symbolic link c. special file b. ordinary file d. named pipe

Absolute

A file's ____ filename includes all path information for that file. a. extended c. relative b. absolute d. long-form

Subdirectory

Although a user directory is treated as a file, it is flagged to indicate to the File Manager that this file is really a ____ whose records are filenames that point to files. a. database c. subdirectory b. volume d. master file directory

IRP

An ____ is a data structure that controls how the I/O operation is processed at each step. a. ITB c. IRP b. IMS d. IRQ

1.25

If 2.5 minutes is the maximum access time for a magnetic tape, ____ is the average access time. a. 0.5 minutes c. 1.25 minutes b. 1 minute d. 2 minutes

hashing

In a direct record organization scheme, the program used to store the data follows a set of instructions, called a ____ algorithm, that transforms each key into a number, the record's logical address. a. hashing c. translation b. grouping d. lookup

null

In indexed storage, when a file is created, the pointers in the index block are all set to ____. a. the end of the volume c. null b. the beginning of the volume d. zero

next extent in the sequence

In noncontiguous storage, one way to link file extents is at the storage level where each extent points to the ____. a. current subdirectory c. master directory entry b. next file in the sequence d. next extent in the sequence

Folders

Many computer users and some operating systems call subdirectories ____. a. folders c. volumes b. files d. databases

seek time

Of the three components of access time in a movable-head DASD, ____ is the slowest. a. seek time c. transfer time b. search time d. delay time

sequential, direct, or indexed sequential

On magnetic disks, files can be organized in one of three ways: ____. a. indexed direct, indexed indirect, or random b. sequential, indirect, or direct c. sequential, random, or indirect d. sequential, direct, or indexed sequential

laser

The advent of optical discs was made possible by developments in ____ technology. a. magnetic c. storage b. laser d. silicone

Allocates

The computer system ____ a file by activating the appropriate secondary storage device and loading the file into memory while updating its records of who is using that file. a. creates c. allocates b. formats d. configures

Floating Gate

To write data to flash memory, a relatively high voltage is sent through one transistor, called the ____, then through a metal oxide layer and into a second transistor called the control gate, where the charge is stored in a cell until it's erased. a. parallel port c. pit b. floating gate d. crystalline port

Transport Speed

Transfer rate of a magnetic tape is measured in inches per second (ips) using the following formula: transfer rate = density * ____. a. block size c. transport speed b. average access time d. sector size Transfer rate of a magnetic tape is measured in inches per second (ips) using the following formula: transfer rate = density * ____. a. block size c. transport speed b. average access time d. sector size

is truncated

When data is stored in fixed length fields, data that extends beyond the fixed size ____. a. generates an operating system error b. is truncated c. is broken up and stored in more than one field d. combines multiple fields to accommodate the data

Directories

____ are special files with listings of filenames and their attributes. a. Databases c. Programs b. Directories d. Data files

Dedicated

____ peripheral devices are assigned to only one job at a time. a. Dedicated c. Virtual b. Shared d. Static