preserves the sign of the multiplication operation.
D) It enhances the speed of the operation significantly.
(84) A cache has 64 blocks; each block is 16 bytes.Which block does byte 1200 map to ?
A) 25 B) 60 C) 75 D)100
(85) Which is NOT a characteristic of an RISC processor?
A) a high clock speed
B) a highly optimized pipeline
C) a few general-purpose registers
D) a limited amount of small instructions
(86)You are performing two sums: the first is a sum of two scalar variables and the second is a matrix sum of a pair of two-dimensional arrays-size 1000 by 1000. What
speedup is achieved when the calculations are performed on size 1000 processors?
(2 Points)
A) 50 B) 100 C) 999 D) none of the above
(87)According to Shannon's equation,what is the channel capacity of an analog voice-grade
phone line with a bandwidth of 3100 Hz and a signal-to-noise ratio or 30dB?(2 Points)
A) 9.1 Kbps B) 9.3 Kbps C) 30.9 Kbps D) 30.17 Kbps
(88)The X.25 standard specifies three layers of functionality. Which layers of the OSI
model correspond to the X.25 layers?
A) th e Physical,Network,and Session Layers
B) the Physical,Data Link,and Network Layers
C) the Physical,Data Link,and Transport Layers
D) the Physical,Session,and Presentation layers
(89)Which routing algorithm is described below?
It is a mechanism in which the setding station determines the route the frame
will follow and includes the routing information with the frame; bridges read the
routing information to determine if they should forward the frame.
A) Fixed Routing B) Spanning Tree
C) Source Routing D) Frame Forwarding
(90) Which OSI layer does a bridge operate at?
A) the Physical Layer B) the Network Layer
C) the Transport Layer D) the Data Link Layer
(69) Which UNIX command creates a symbolic link named myfile in the current directory to
the file/etc/hosts?
A) In -s /etc/hosts myfile B) In -s myfile /etc/hosts
C) link -s /etc/hosts myfile D) link -s myfile /etc/hosts
(70)Which MS-DOS command is correct?
A) DEL /s *.bat B) DEL *.exe/sp
C) DEL *.obj >nul: D) DEL *.com *.sys
(71)A virtual memory system has five virtual pages numbered zero through four and
three page frames. All the page frames are initially empty. How many page faults
are generated with the following access sequence using a FIFO replacement policy?
(2 Points)
0 1 2 3 0 1 5 0 1 2 3 4
A) 8 B) 9 C) 10 D) 11
(72)Which element is NOT part of a microkernel? (2 Points)
A) basic I/O B) a file system
C) IPC mechanisms D) memory management
(73)Which is local to a thread instead of a process? (2 Points)
A) a stack B) an open file C) a semaphores D) an address space
(74)What is a subselect statement?
A)a select statement that selects a subset of fields in a table
B)a select statement that re
turns a subset of the data in a table
C)a select statement that appears within another select statement
D)a select statement that returns a subset of the constraints on a field
(75)In developing a hospital database,it is determined that on the average,each patient
will have 6 treatments during a hospital stay. The averge length of a stay is three
days.The hospital has 1000 beds.There are on the average 800 patients occupying
beds each day.The relationship between PATIENT and TREATMENT is l:M.The relationship
between PATIENT and BED is 1: 1,conditional. If treatment record occurrences are
archived as soon as a&nbs
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