Networking Chapter 6 The subnet mask of an IP address does which of the following?

Guide to Networking Essentials, 8th ed., ISBN 9780357118283

Chapter 6 Solutions-1

Chapter 6 Solutions

Review Questions

1. An IPv6 address is made up of how many bits?

a. 32

c. 64

e. 256

2. The subnet mask of an IP address does which of the following?

a. Provides encryption in a TCP/IP network

c. Allows automated IP address configuration

3. Which of the following is needed if a computer with the IP address 172.31.210.10/24 wants to

communicate with a computer with the IP address 172.31.209.122/24?

a. Hub

d. Server

4. Which of the following is a private IP address and can’t be routed across the Internet?

a. 192.156.90.100

d. 221.24.250.207

e. 12.12.12.12

5. Which command should you use with a dual-homed server to make sure the server sends

packets out the correct interface?

a. ipconfig

b. ping

Guide to Networking Essentials, 8th ed., ISBN 9780357118283

Chapter 6 Solutions-2

6. Which command should you use to configure the primary DNS server on your computer?

a. ipconfig

d. arp

7. Which IP address expressed in CIDR notation has the subnet mask 255.255.255.0?

b. 172.16.88.222/16

d. 172.29.111.201/18

8. Which IP network address expressed in CIDR notation can support a maximum of 1022

hosts?

a. 10.100.44.0/24

c. 192.168.100.64/26

9. The IP address 10.240.0.0/8 can’t be assigned to a host. True or False?

10. What’s the term for each grouping of 8 bits in an IP address?

a. Quartet

b. Quintet

11. When using TCP/IP, which of the following must computers on the same logical network

have in common? (Choose all that apply.)

b. Host ID

d. Computer name

Guide to Networking Essentials, 8th ed., ISBN 9780357118283

Chapter 6 Solutions-3

12. Which of the following IPv6 features is an enhancement to IPv4? (Choose all that apply.)

b. Works at the Internetwork and Transport layers

d. Connectionless communication

13. Which protocol can configure a computer’s IP address and subnet mask automatically?

a. TCP

b. IP

c. ARP

14. How many bits must be reallocated from a host ID to a network ID to create 16 subnets?

a. 6

d. 28

15. For the Class C network address 192.168.10.0, which of the following subnet masks provides

32 subnets?

a. 255.255.255.252

d. 255.255.255.224

16. How many host bits are necessary to assign addresses to 62 hosts?

c. 4

d. 3

17. Which IP addressing process enables workstations to use private IP addresses to access the

Internet?

a. Supernetting

d. Subnetting

18. When a Windows computer is configured to use DHCP but no DHCP server is available,

what type of address is configured automatically for it?

a. PAT

d. Static

19. Which of the following represents a valid IPv6 address?

a. 2001:345:abcd:0:230:44

d. 2001:345:abcd:0:FEED:230:44

20. Which of the following is a reason to subnet? (Choose all that apply.)

b. Subnetting eliminates the need for routers.

d. There’s no need to assign static IP addresses to each computer.

21. Which of the following IP addresses has 12 bits in the host ID?

a. 172.31.21.12/16

c. 12.49.127.88/8

22. You have a server with two NICs, each attached to a different IP network. You’re having

problems communicating with devices on remote networks that send packets to one of the

interfaces. The server receives the packets fine, but the server’s replies never reach the

intended destination network. Replies to packets that come in through the other interface seem

to reach their destination without any problems. What can you do that will most likely solve

Guide to Networking Essentials, 8th ed., ISBN 9780357118283

Chapter 6 Solutions-5

the problem?

a. Configure a second default gateway on the interface exhibiting problems.

b. Change the default gateway to use the router that’s on the network of the interface

exhibiting problems.

23. You have just changed the IP address from 172.31.1.10/24 to 172.31.1.110/24 on a computer

named computer5 in your domain. You were communicating successfully with this computer

from your workstation before you changed the address. Now when you try the command

ping computer5 from your workstation, you don’t get a successful reply. Other

computers on the network aren’t having a problem communicating with the computer. Which

command might help solve the problem?

c. tracert computer5

d. ping -6 172.31.1.110

24. Which address can’t be assigned to a host computer?

c. 192.168.100.66/26

d. 172.29.132.0/18

25. Which IPv6 transition technology can be used with NAT routers and has the address prefix

2001::/32?

c. 6to4

d. IPv6-over-IPv4

26. How many bits are in the interface ID of an IPv6 address?

a. 32

d. 48

27. What address should you ping if you want to test local IPv6 operation but don’t want to

actually send any packets on the network?

a. 1::f

b. 2001::db8

Hands-On Projects

Hands-On Project 6-1

Decimal number

Binary number

167

10100111

149

10010101

252

11111100

128

10000000

64

01000000

240

11110000

255

11111111

14

00001110

15

00001111

63

00111111

188

10111100

224

11100000

Hands-On Project 6-2

Binary number

Decimal number

00110101

53

11111000

248

00011111

31

10101010

170

01010101

85

11111110

254

11111100

252

00111011

59

11001100

204

00110011

51

00000111

7

00111100

60

Guide to Networking Essentials, 8th ed., ISBN 9780357118283

Chapter 6 Solutions-7

Hands-On Project 6-3

Network/prefix

Subnet mask

Host bits

Number of hosts

172.16.1.0/24

255.255.255.0

8

254

10.1.100.128/26

255.255.255.192

6

62

10.1.96.0/19

255.255.224

13

8190

192.168.1.0/24

255.255.255.0

8

254

172.31.0.0/16

255.255.0.0

16

65534

10.255.255.252/30

255.255.255.252

2

172.28.240.0/20

255.255.240.0

12

4094

10.44.108.0/22

255.255.252.0

10

1022

192.168.100.24/21

255.255.248.0

11

2046

172.23.64.0/18

255.255.192.0

14

16382

192.168.5.128/25

255.255.255.128

7

126

Hands-On Project 6-4

Network ID

Required hosts

Host bits needed

Network ID/prefix

172.16.1.0

254

8

172.16.1.0/24

10.1.100.128

62

6

10.1.100.128/26

10.1.96.0

8190

13

10.1.96.0/19

192.168.1.0

200

8

192.168.1.0/24

172.31.0.0

65000

16

172.31.0.0/16

10.255.255.252

2

10.255.255.252/30

172.28.240.0

4000

12

172.28.240.0/20

10.44.108.0

900

10

10.44.108.0/22

192.168.240.0

2200

12

192.168.240.0/20

172.23.64.0

16000

14

172.23.64.0/18

192.168.5.128

110

7

192.168.5.128/25

Guide to Networking Essentials, 8th ed., ISBN 9780357118283

Chapter 6 Solutions-8

Challenge Labs

Challenge Lab 6-1

• Number of subnets needed: 5

• Subnet mask: 255.255.255.224

• Number of subnets created: 8

Network number in CIDR

Host address range

192.168.10.0/27

192.168.10.1–192.168.10.30

192.168.10.32/27

192.168.10.33–192.168.10.62

192.168.10.64/27

192.168.10.65–192.168.10.94

192.168.10.96/27

192.168.10.97–192.168.10.126

192.168.10.128/27

192.168.10.129–192.168.10.158

Case Projects

Case Project 6-1

Subnet mask: 255.255.255.240

Case Project 6-2

Answers will vary. In this sample answer, each location has the first 56 bits assigned. Students create up to

256 subnets because they have 8 bits they can use to create subnets. For example, Location 1 can have

subnets 2001:DB8:FAB:0100, 2001:DB8:FAB:0101, 2001:DB8:FAB:0102, and so forth, up to

2001:DB8:FAB:01FF.

Location 1: 2001:DB8:FAB:0100/56

Location 4: 2001:DB8:FAB:0400/56

Case Project 6-3

Students should say they need to set up a NAT device (usually the router that connects the network to the