Number Systems

Question 1

___ are important for representing addresses and data in computer systems and networks

Answer 1

Number systems

Question 2

Some attack vectors involve causing numerical…

Answer 2

overflows

Question 3

a particular method for executing an attack.

Answer 3

attack vector

Question 4

1010 in decimal

Answer 4

10

Question 5

111 in decimal

Answer 5

7

Question 6

___ binary digits represent one octal digit

Answer 6

3

Question 7

75 octal to binary

Answer 7

111 101

Question 8

61 octal to decimal

Answer 8

49

Question 9

101101 to octal

Answer 9

55 octal

Question 10

42 decimal to octal

Answer 10

52 octal

Question 11

A5 hex to binary

Answer 11

1010 0101

Question 12

A5 hex to decimal

Answer 12

165

Question 13

To convert from decimal to binary

1. Divide the original number by 2 and note the remainder.
2. Keep dividing the ___1 (noting the remainder each time) until the ___1 becomes zero.
3. Read the remainders ___2 for the result.

Answer 13

1. intermediate quotient

2. in reverse order

Question 14

___ binary digits represent one hex digit

Answer 14

4

Question 15

111010101 to hex

Answer 15

1D5

Question 16

Using ___ bits, we can represent 16 numbers.

Answer 16

4

Question 17

4 unsigned bits can represent numbers ranged…

Answer 17

0 - 15

Question 18

4 signed bits can represent numbers ranged…

Answer 18

-8 - 7

Question 19

Using 8 bits, we can represent ___ numbers.

Answer 19

256

Question 20

8 signed bits can represent numbers ranged…

Answer 20

-128 - 127

Question 21

in a 4-bit system with negatives, what happens when we try to add 5 and 6?

Answer 21

overflow

Question 22

-5 in binary using one’s complement

Answer 22

1010

Question 23

-3 in binary using two’s complement

Answer 23

1101

Question 24

to get a negative number using one’s complement, take the corresponding positive value and…

Answer 24

flip each bit

Question 25

two ways to get a negative using two’s complement

Answer 25

1. flip each bit then add 1

2. subtract 1 then flip each bit

Question 26

a binary number is negative if…

Answer 26

the leftmost bit is 1

Question 27

signed 1101 0011 in decimal

Answer 27

-45

Question 28

signed 1111 1111 in decimal

Answer 28

-1

Question 29

signed 1000 0000 in decimal

Answer 29

-128

Question 30

signed 0111 1111 in decimal

Answer 30

127

Question 31

negate 0000 1111

Answer 31

1111 0001

Question 32

negate 1000 1111

Answer 32

0111 0001

Question 33

to subtract in binary

Answer 33

add the negated value

Question 34

when adding two positive numbers, overflow has occured if and only if…

Answer 34

the result is negative

Question 35

when adding two negative numbers, overflow has occured if and only if…

Answer 35

the result is positive

Question 36

when adding two 4-bit unsigned numbers, overflow has occured if…

Answer 36

there is a carry into the 5th bit