The Ping of Death is an exploit that sends multiple ICMP packets to a host faster than the host can handle.
a. true
b. false
Answer: b. false
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When a payroll program verifies that no value greater than 168 is entered for the number of hours worked in a week (24 hours in a day X 7 days in a week), it is performing a __________ check.
Fill in the blank(s) with the appropriate word(s).
What is the best method for disposal for empty inkjet printer cartridges and empty toner cartridges?
A. Place cartridges in plastic trash bags and dispose with company trash service. B. Flush each empty cartridge with water, wrap in plastic, and place in trash. C. Flush each cartridge with water and recycle with office recycling service. D. Check with local environmental officials in your area for proper disposal of these items.
Suppose that a disk unit has the following parameters: seek time s=20 msec; rotational delay rd=10 msec; block transfer time btt=1 msec; block size B=2400 bytes; interblock gap size G=600 bytes. An EMPLOYEE file has the following fields: SSN, 9 bytes; LASTNAME, 20 bytes; FIRSTNAME, 20 bytes; MIDDLE INIT, 1 byte; BIRTHDATE, 10 bytes; ADDRESS, 35 bytes); PHONE, 12 bytes); SUPERVISORSSN, 9 bytes; DEPARTMENT, 4 bytes; JOBCODE, 4 bytes; deletion marker, 1 byte. The EMPLOYEE file has r=30000 STUDENT records, fixed-length format, and unspanned blocking. Write down appropriate formulas and calculate the following values for the above EMPLOYEE file:
(a) The record size R (including the deletion marker), the blocking factor bfr, and the number of disk blocks b. (b) Calculate the wasted space in each disk block because of the unspanned organization. (c) Calculate the transfer rate tr and the bulk transfer rate btr for this disk (see Appendix B for definitions of tr and btr). (d) Calculate the average number of block accesses needed to search for an arbitrary record in the file, using linear search. (e) Calculate the average time needed in msec to search for an arbitrary record in the file, using linear search, if the file blocks are stored on consecutive disk blocks and double buffering is used. (f) Calculate the average time needed in msec to search for an arbitrary record in the file, using linear search, if the file blocks are not stored on consecutive disk blocks. (g) Assume that the records are ordered via some key field. Calculate the average number of block accesses and the average time needed to search for an arbitrary record in the file, using binary search.
In what filesystem are most of the operating system files contained?
A. boot B. data C. mnt D. root