Network+ Study Guide 08 (Chapter)

Front 1

08.01
2^0 = ?

Back 1

2^0 = 1

Front 2

08.02
2^1 = ?

Back 2

2^1 = 2

Front 3

08.03
2^2 = ?

Back 3

2^2 = 4

Front 4

08.04
2^3 = ?

Back 4

2^3 = 8

Front 5

08.05
2^4 = ?

Back 5

2^4 = 16

Front 6

08.06
2^5 = ?

Back 6

2^5 = 32

Front 7

08.07
2^6 = ?

Back 7

2^6 = 64

Front 8

08.08
2^7 = ?

Back 8

2^7 = 128

Front 9

08.09
2^8 = ?

Back 9

2^8 = 256

Front 10

08.10
2^9 = ?

Back 10

2^9 = 512

Front 11

08.11
2^10 = ?

Back 11

2^10 = 1,024

Front 12

08.16
What is decimal for the binary 10000000?

Back 12

128

Front 13

08.17
What is decimal for the binary 11000000?

Back 13

192

Front 14

08.18
What is decimal for the binary 11100000?

Back 14

224

Front 15

08.19
What is decimal for the binary 11110000?

Back 15

240

Front 16

08.20
What is decimal for the binary 11111000?

Back 16

248

Front 17

08.21
What is decimal for the binary 11111100?

Back 17

252

Front 18

08.22
What is decimal for the binary 11111110?

Back 18

254

Front 19

08.23
What is decimal for the binary 11111111?

Back 19

255

Front 20

08.24
Formula for the number of subnets given a CIDR notation?

Back 20

Two steps:

1) n = number borrowed bits
(ie. a class C subnet 255.255.255.224 /27 burrows 3 bits since 11100000 (base2) = 224 (base 10))

2) s = number of subnets = 2^n

Front 21

08.25
Formula for number of hosts in a subnet?

Back 21

Two steps:

1) n = number of hostbits

2) h = 2^n - 2

Front 22

08.26
Formula for subnet block-size?

Back 22

Two steps:

1) x = decimal value of “borrowed bits”

2) b = block-size = 256-x

Front 23

08.101
What is the maximum number of IP addresses that can be assigned to hosts on a local subnet
that uses the 255.255.255.224 subnet mask?
A. 14
B. 15
C. 16
D. 30
E. 31
F. 62

Back 23

What is the maximum number of IP addresses that can be assigned to hosts on a local subnet
that uses the 255.255.255.224 subnet mask?
A. 14
B. 15
C. 16
D. 30
E. 31
F. 62

Front 24

08.102
You have a class A host of 10.0.0.110/25. It needs to communicate to a host with an
IP address of 10.0.0.210/25. Which of the following devices do you need to use in order
for these hosts to communicate?
A. A layer 2 switch
B. Router
C. DNS server
D. Hub

Back 24

You have a class A host of 10.0.0.110/25. It needs to communicate to a host with an
IP address of 10.0.0.210/25. Which of the following devices do you need to use in order
for these hosts to communicate?
A. A layer 2 switch
B. Router ( See below)
C. DNS server
D. Hub

Notice the 10.W.X.Y /25 gives you a Class A private network with...

1) Subnet mask 255.255.255.128.

2) 2 subnets with a block size of 256-128=128.
* 1st network
… address = 10.0.0.0
… hosts on 10.0.0.1 to 10.0.0.126
… broadcast on 10.0.0.127
* 2nd network
… address = 10.0.0.128
… hosts on 10.0.0.129 to 10.0.0.254
… broadcast on 10.0.0.255

Front 25

08.103
What is the subnetwork address for a host with the IP address 200.10.5.68/28?
A. 200.10.5.56
B. 200.10.5.32
C. 200.10.5.64
D. 200.10.5.0

Back 25

What is the subnetwork address for a host with the IP address 200.10.5.68/28?
A. 200.10.5.56
B. 200.10.5.32
C. 200.10.5.64
D. 200.10.5.0 (Don’t overthink things. The 200.W.X.Y address is Class C. Class C has a natural CIDR mask of /28)

Front 26

08.104
The network address of 172.16.0.0/19 provides how many subnets and hosts?
A. 7 subnets, 30 hosts each
B. 7 subnets, 2,046 hosts each
C. 7 subnets, 8,190 hosts each
D. 8 subnets, 30 hosts each
E. 8 subnets, 2,046 hosts each
F. 8 subnets, 8,190 hosts each

Back 26

The network address of 172.16.0.0/19 provides how many subnets and hosts?
A. 7 subnets, 30 hosts each
B. 7 subnets, 2,046 hosts each
C. 7 subnets, 8,190 hosts each
D. 8 subnets, 30 hosts each
E. 8 subnets, 2,046 hosts each
F. 8 subnets, 8,190 hosts each

Front 27

08.105
You receive a call from a user that is complaining that they cannot get on the Internet. You
have them verify their IP address, mask, and default gateway. The IP address is 10.0.37.144,
with a subnet mask of 255.255.254.0. The default gateway is 10.0.38.1. What is the problem?
A. Invalid IP address
B. Invalid subnet mask
C. gateway IP is incorrect
D. IP address and mask are not compatible.

Back 27

You receive a call from a user that is complaining that they cannot get on the Internet. You
have them verify their IP address, mask, and default gateway. The IP address is 10.0.37.144,
with a subnet mask of 255.255.254.0. The default gateway is 10.0.38.1. What is the problem?
A. Invalid IP address
B. Invalid subnet mask
C. gateway IP is incorrect (Actually, they are in different subnets)
D. IP address and mask are not compatible.

Front 28

08.106
If a host on a network has the address 172.16.45.14/30, what is the subnetwork this host
belongs to?
A. 172.16.45.0
B. 172.16.45.4
C. 172.16.45.8
D. 172.16.45.12
E. 172.16.45.16

Back 28

If a host on a network has the address 172.16.45.14/30, what is the subnetwork this host
belongs to?
A. 172.16.45.0
B. 172.16.45.4
C. 172.16.45.8
D. 172.16.45.12 (One crazy question with tiny subnets.)
E. 172.16.45.16

Front 29

08.107
On a network, which mask should you use on point-to-point WAN links in order to reduce
the waste of IP addresses?
A. /27
B. /28
C. /29
D. /30
E. /31

Back 29

On a network, which mask should you use on point-to-point WAN links in order to reduce
the waste of IP addresses?
A. /27
B. /28
C. /29
D. /30 (Note that a /30 has 2 host bits, allowing 2^2-2 = 4-2 = 2 hosts. The /31 would have no hosts since 2^1-2 = 2-2 - 0.)
E. /31

Front 30

08.108
On which of the following devices are you most likely to be able to implement NAT?
A. Hub
B. Ethernet switch
C. Router
D. Bridge

Back 30

On which of the following devices are you most likely to be able to implement NAT?
A. Hub
B. Ethernet switch
C. Router
D. Bridge

Front 31

08.109
You have an interface on a router with the IP address of 192.168.192.10/29. Including the
router interface, how many hosts can have IP addresses on the LAN attached to router
interface?
A. 6
B. 8
C. 30
D. 62
E. 126

Back 31

You have an interface on a router with the IP address of 192.168.192.10/29. Including the
router interface, how many hosts can have IP addresses on the LAN attached to router
interface?
A. 6
B. 8
C. 30
D. 62
E. 126

Front 32

08.110
When configuring the IP settings on a computer on one subnet to ensure it can communicate
with a computer on another subnet, which of the following is desirable?
A. Configure the computer with the same default gateway as the other computer.
B. Configure the computer with the same subnet mask as the other computer.
C. Configure the computer with a default gateway that matches the IP address of the
router’s interface that is attached to the same subnet as the computer.
D. Configure the computer with a subnet mask that matches the IP address of the router’s
interface that is attached to the same subnet as the computer.

Back 32

When configuring the IP settings on a computer on one subnet to ensure it can communicate
with a computer on another subnet, which of the following is desirable?
A. Configure the computer with the same default gateway as the other computer.
B. Configure the computer with the same subnet mask as the other computer.
C. Configure the computer with a default gateway that matches the IP address of the
router’s interface that is attached to the same subnet as the computer.
D. Configure the computer with a subnet mask that matches the IP address of the router’s
interface that is attached to the same subnet as the computer.

Front 33

08.111
You have an interface on a router with the IP address of 192.168.192.10/29. What is the
broadcast address the hosts will use on this LAN?
A. 192.168.192.15
B. 192.168.192.31
C. 192.168.192.63
D. 192.168.192.127
E. 192.168.192.255

Back 33

You have an interface on a router with the IP address of 192.168.192.10/29. What is the
broadcast address the hosts will use on this LAN?
A. 192.168.192.15
B. 192.168.192.31
C. 192.168.192.63
D. 192.168.192.127
E. 192.168.192.255

Front 34

08.112
What is the highest usable address on the 172.16.1.0/24 network?
A. 172.16.1.255
B. 172.16.1.254
C. 172.16.1.253
D. 172.16.1.23

Back 34

What is the highest usable address on the 172.16.1.0/24 network?
A. 172.16.1.255
B. 172.16.1.254
C. 172.16.1.253
D. 172.16.1.23

Front 35

08.114
If an Ethernet port on a router were assigned an IP address of 172.16.112.1/25, what would
be the subnet address of this host?
A. 172.16.112.0
B. 172.16.0.0
C. 172.16.96.0
D. 172.16.255.0
E. 172.16.128.0

Back 35

If an Ethernet port on a router were assigned an IP address of 172.16.112.1/25, what would
be the subnet address of this host?
A. 172.16.112.0
B. 172.16.0.0
C. 172.16.96.0
D. 172.16.255.0
E. 172.16.128.0

Front 36

08.117
If you are forced to replace a router that has failed to the point that you are unable to access
its current configuration to aid in setting up interface addresses on the new router, which of
the following can you reference for assistance?
A. The default-gateway settings on computers from each subnet that the old router interconnected.
B. The router’s configuration that was periodically cached on the DHCP server.
C. The router’s configuration that was periodically cached on the DNS server.
D. The new router will auto-configure itself with the correct settings.

Back 36

If you are forced to replace a router that has failed to the point that you are unable to access
its current configuration to aid in setting up interface addresses on the new router, which of
the following can you reference for assistance?
A. The default-gateway settings on computers from each subnet that the old router interconnected.
B. The router’s configuration that was periodically cached on the DHCP server.
C. The router’s configuration that was periodically cached on the DNS server.
D. The new router will auto-configure itself with the correct settings.

Front 37

08.118
You have a network with a subnet of 172.16.17.0/22. Which is the valid host addresses?
A. 172.16.17.1 255.255.255.252
B. 172.16.0.1 255.255.240.0
C. 172.16.20.1 255.255.254.0
D. 172.16.16.1 255.255.255.240
E. 172.16.18.255 255.255.252.0
F. 172.16.0.1 255.255.255.0

Back 37

You have a network with a subnet of 172.16.17.0/22. Which is the valid host addresses?
A. 172.16.17.1 255.255.255.252
B. 172.16.0.1 255.255.240.0
C. 172.16.20.1 255.255.254.0
D. 172.16.16.1 255.255.255.240
E. 172.16.18.255 255.255.252.0
F. 172.16.0.1 255.255.255.0

Front 38

08.119
Your router has the following IP address on Ethernet0: 172.16.2.1/23. Which of the following
can be valid host IDs on the LAN interface attached to the router? (Choose two.)
A. 172.16.0.5
B. 172.16.1.100
C. 172.16.1.198
D. 172.16.2.255
E. 172.16.3.0
F. 172.16.3.255

Back 38

Your router has the following IP address on Ethernet0: 172.16.2.1/23. Which of the following
can be valid host IDs on the LAN interface attached to the router? (Choose two.)
A. 172.16.0.5
B. 172.16.1.100
C. 172.16.1.198
D. 172.16.2.255
E. 172.16.3.0 (Both would be in the range of valid addresses)
F. 172.16.3.255

Front 39

08.120
You have one IP address provided from your ISP with a /30 mask. However, you have 300
users that need to access the Internet. What technology will you use to implement a solution?
A. PAT
B. VPN
C. DNS
D. LANs

Back 39

You have one IP address provided from your ISP with a /30 mask. However, you have 300
users that need to access the Internet. What technology will you use to implement a solution?
A. PAT (PAT will give you approximately 65,000 hosts)
B. VPN
C. DNS
D. LANs