Question Set 4

QUESTION NO: 5
How would the number 172 be expressed in binary form?
A. 10010010
B. 10011001
C. 10101100
D. 10101110
Answer: C
Explanation:
10101100= 128 + 0 + 32 + 0 + 8 + 4 + 0 + 0 = 172
Incorrect Answers:
A. Binary 10010010 = 128+0+0+16+0+0+2+0=146
B. Binary 10011001 = 128+0+0+16+8+0+0+1=153
D. Binary 10101110 = 128+0+32+0+8+4+2+0= 174
QUESTION NO: 6
The MAC address for your PC NIC is: C9-3F-32-B4-DC-19. What is the address of
the OUI portion of this NIC card, expressed as a binary number?
A. 11001100-00111111-00011000
B. 11000110-11000000-00011111
C. 11001110-00011111-01100000
D. 11001001-00111111-00110010
E. 11001100-01111000-00011000
F. 11111000-01100111-00011001

Answer: D
Explanation:
The first half of the address identifies the manufacturer of the card. This code, which is
assigned to each manufacturer by the IEEE, is called the organizationally unique
identifier (OUI). In this example, the OUI is C9-3F-32. If we take this number and
convert it to decimal form we have:
C9 = (12x16) + 9 = 201
3F = (3x16) + 15 = 63
32 = (3x16) + 2 = 50
So, in decimal we have 201.63.50. If we then convert this to binary, we have:
201 = 11001001
63 = 00111111
50 = 00110010
So the correct answer is D: 11001001-00111111-00110010


QUESTION NO: 7
How do you express the binary number 10110011 in decimal form?
A. 91
B. 155
C. 179
D. 180
E. 201
F. 227
Answer: C
Explanation:
If you arrange the binary number 10110011, against the place value and multiply the
values, and add them up, you get the correct answer.
1 0 1 1 0 0 1 1
128 64 32 16 8 4 2 1
128 + 0 + 32 +16 + 0 + 0 +2 +1 = 179