Networking Devices and Initial Configuration Module 3.3.3 Number Systems Quiz Answers
1. What is the binary representation for the decimal number 173?
- 10100111
- 10100101
- 10101101
- 10110101
Explanation: decimal 173 = 128 + 0 + 32 + 0 + 8 + 4 + 0 + 1
2. How many bits make up an octet in an IPv4 address?
- 4
- 8
- 16
- 32
Explanation: An IPv4 address consists of a string of 32 bits divided into four sections called octets. Each octet contains 8 bits (or 1 byte) separated with a dot.
3. What is the decimal equivalent of 0xC9?
- 185
- 200
- 201
- 199
Explanation: 0x refers to the item as hexadecimal. Convert each character into its corresponding nibble. Then combine the nibbles together and calculate the resulting decimal equivalent. C has a value of 12. 12 x 16 = 192. 192 + 9 = 201.
4. What is the binary representation of 0xCA?
- 10111010
- 11010101
- 11001010
- 11011010
Explanation: When converted, CA in hex is equivalent to 11011010 in binary. One way to do the conversion is one nibble at a time, C = 1100 and A = 1010. Combine the two nibbles gives 11001010.
5. What is the range of hexadecimal values that can be used in a hextet?
- 0000 to 1111
- 0000 to ffff
- 1111 to aaaa
- 0000 to 9999
Explanation: A hextet is a term used to refer to a segment of 16 bits or four hexadecimal values. A single hexadecimal number is made up with 4 bits, thus the range of a hexadecimal number is from 0 to f. A hextet contains 4 hexadecimal numbers and ranges from 0000 to ffff.
6. What is the hexadecimal equivalent for the binary number 10011101?
- 85
- 9D
- A1
- D9
Explanation: Each 4 binary digits equates to 1 hexadecimal digit.
1001 = 9
1101 = 13 (decimal) = D (hexadecimal)
7. How many bits are in an IPv4 address?
- 32
- 64
- 128
- 256
Explanation: An IPv4 address is comprised of 4 octets of binary digits, each containing 8 bits, resulting in a 32-bit address.
8. A network engineer wants to represent confidential data in binary format. What are the two possible values that the engineer can use? (Choose two.)
- 0
- 1
- 2
- A
- F
Explanation: Binary is a numbering system that consists of the digits 0 and 1 called bits.
9. What is the hexadecimal equivalent for the decimal number 139?
- 8B
- 92
- A1
- D7
Explanation: Decimal 139 in binary is 10001011. 128+8+2+1 = 139.
Each 4 binary digits equates to 1 hexadecimal digit.
1000 = 8
1011 = 11 (decimal) = B (hexadecimal)
10. Which is a valid hexadecimal number?
- f
- g
- h
- j
Explanation: The hexadecimal numbers are 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f.. The hexadecimal number 0 represents 0 in decimal and is represented as 0000 in binary. The hexadecimal number f represents 15 in decimal .
11. What is the binary equivalent of the decimal number 232?
- 11101000
- 11000110
- 10011000
- 11110010
Explanation: 232 in binary is 11101000. 128+64+32+8 = 232
12. Given the binary address of 11101100 00010001 00001100 00001010, which address does this represent in dotted decimal format?
- 234.17.10.9
- 234.16.12.10
- 236.17.12.6
- 236.17.12.10
Explanation: The binary number 11101100 00010001 00001100 00001010 translates to 236.17.12.10.