Shell subsystems that have only a limited access to system information and can access hardware only through other OS services are operating in what mode?
A. process mode
B. elevated privilege mode
C. user mode
D. kernel mode
Answer: C
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The purpose of the ________ element is used to configure the heading for a web page document or section of a web page document.
a. heading b. nav c. header d. head
Suppose the file is not ordered by the non-key field DEPARTMENTCODE and we want to construct a secondary index on SSN using Option 3 of Section 18.1.3, with an extra level of indirection that stores record pointers. Assume there are 1000 distinct values of DEPARTMENTCODE, and that the EMPLOYEE records are evenly distributed among these values. Calculate (i) the index blocking factor bfr i (which is also the index fan-out fo); (ii) the number of blocks needed by the level of indirection that stores record pointers; (iii) the number of first-level index entries and the number of first-level index blocks; (iv) the number of levels needed if we make it a multi-level index; (v) the total number of blocks required by the multi-level index and the blocks used in the extra level of indirection; an
Consider a disk with block size B=512 bytes. A block pointer is P=6 bytes long, and a record pointer is P R =7 bytes long. A file has r=30,000 EMPLOYEE records of fixed-length. Each record has the following fields: NAME (30 bytes), SSN (9 bytes), DEPARTMENTCODE (9 bytes), ADDRESS (40 bytes), PHONE (9 bytes), BIRTHDATE (8 bytes), SEX (1 byte), JOBCODE (4 bytes), SALARY (4 bytes, real number). An additional byte is used as a deletion marker.
Exploding a pie slice is a common pie chart enhancement
Indicate whether the statement is true or false.
Which of the following is a variation of spread-spectrum technology use in wireless local-area networks? (Choose three.)
A) WEP B) Wi-Fi C) WPA - 2 D) Direct-sequence spread spectrum (DSSS) E) Frequency-hopping spread spectrum (FHSS) F) Orthogonal frequency-division multiplexing (OFDM)