Chapter 8 Practice Test Answers
1. B. There are 32 bits in an IPv4 address.
2. D. ARIN is the regional agency for North America, South America, and SubSaharan Africa.
3. C. The network number for address 155.155.155.154 falls within the range of
128.0.0.0 to 191.255.255.0.
4. A. IPv6 addresses are made up of a series of 128 bits expressed in hexadecimal
format.
5. C and D. 197.89.78.158 and 197.89.78.132 are part of the network represented by
197.89.78.128.
6. B. When converted to decimal notation, 01100101.10001111.01000010.00001101
equals 101.143.66.13.
7. C. The high order bit, or most significant bit, is the leftmost bit in each of the four
octets.
8. D. The two basic components of every IPv4 address are the network number and
the host number.
9. B. 197.88.43.158 is a Class C address. The default mask for a Class C address is
255.255.255.0.
10. B. Class B addresses use 16 bits for the network number, allowing 16 bits for host
numbers. Each octet has 8 bits, so there are two octets available for host
numbering.
11. B. Private addresses are not routed on the Internet and cannot be used to
communicate outside the private network.
12. A. IPv6 addresses are expressed in hexadecimal code, which limits the character
set to 0–9 and A–F. One time in the address, a set or set of bits that are zeros may
be left out and replaced with a double colon (::).
13. C. Class A addresses fall into the range of networks 1.0.0.0 through 126.255.0.0.
14. B. IPv6 client machines need a globally unique address to communicate over the
public internetwork.
15. B and D. Both 255.255.240 and 255.255.248.0 will allow enough networks to
accommodate the 10 subnetworks.
16. D. 255.0.0.0 is the default subnet mask for Class A networks; 101.2.1.2 is a Class
A address.
17. B. The EUI64 address is the host device’s MAC address with filler in the middle.
All MAC addresses are unique and stay with the host device wherever the device
may connect.
18. A. 202.17.45.1 is the only address that is a part of the 202.17.45.0/24 network.
19. B. 138.15.22.31 is a Class B address. Class B addresses use the first 16 bits for
the network number.
20. D. In a broadcast address, all the bits are turned on. Each octet is separated by a
dot, known as dotted decimal notation.
21. C. The last 64 bits of an IPv6 address are used for the host number.
22. B. The broadcast address for network 153.20.0.0 would be expressed by turning
on all the host bits, resulting in an address of 153.20.255.255.
23. C. The rightmost bit in an octet is the least significant bit, sometimes referred to
as the low order bit.