-currently has 25 subnets
-uses a Class B IP address
-has a maximum of 300 computers on any network segment
-needs to leave the fewest unused addresses in each subnet
What subnet mask is appropriate to use in this company?
a. 255.255.240.0
b. 255.255.248.0
c. 255.255.254.0
d. 255.255.255.0
e. 255.255.255.128
f. 255.255.255.248
Jawaban : b. 255.255.248.0
25 subnet → 25 = 32
11111111.11111111.11111000.00000000 = 255.255.248.0
2. Refer to the exhibit. Host A is being manually configured for connectivity to the LAN.
Which two addressing scheme combinations are possible configurations that can be applied
to the host for connectivity? (Choose two.)
a. Address - 192.168.1.14
Gateway - 192.168.1.33
b. Address - 192.168.1.45
Gateway - 192.168.1.33
c. Address - 192.168.1.32
Gateway - 192.168.1.33
d. Address - 192.168.1.82
Gateway - 192.168.1.65
e. Address - 192.168.1.63
Gateway - 192.168.1.65
f. Address - 192.168.1.70
Gateway - 192.168.1.65
Jawaban : d. Address 192.168.1.82 Gateway 192.168.1.65 dan f. Address 192.168.1.70 Gateway 192.168.1.65
Karena pilihan a,b,c gatewaynya untuk jaringan yang lain sedangkan pilihan e addressnya untuk jaringan lain juga.
3. A NIC of a computer has been assigned an IP address of 172.31.192.166 with a mask of
255.255.255.248. To which subnet does the IP address belong?
a. 172.31.0.0
b. 172.31.160.0
c. 172.31.192.0
d. 172.31.248.0
e. 172.31.192.160
f. 172.31.192.248
Jawaban : e. 172.31.192.160
Host 23-2 = 8-2 = 6 host/subnet
172.31.192.0 172.31.192.1-172.31.192.6 172.31.192.7
172.31.192.8 172.31.192.9-172.31.192.14 172.31.192.15
..............................................................................................
..............................................................................................
172.31.192.152 172.31.192.153-172.31.192.158 172.31.192.159
172.31.192.160 172.31.192.161-171.31.192.166 172.31.192.167
IP address 172.31.192.166 berada pada Network Id 172.31.192.160
4. Which subnet masks would be valid for a subnetted Class B address? (Choose two.)
a. 255.0.0.0
b. 255.254.0.0
c. 255.224.0.0
d. 255.255.0.0
e. 255.255.252.0
f. 255.255.255.192
Jawab : e. 255.255.252.0 dan d. 255.255.0.0
Karena pilihan yang lain untuk kelas a dan c
5. Which combination of network id and subnet mask correctly identifies all IP addresses
from 172.16.128.0 through 172.16.159.255?
a. 172.16.128.0 and 255.255.255.224
b. 172.16.128.0 and 255.255.0.0
c. 172.16.128.0 and 255.255.192.0
d. 172.16.128.0 and 255.255.224.0
e. 172.16.128.0 and 255.255.255.192
Jawaban : d. 172.16.128.0 and 255.255.254.0
25-2 = 30
172.16.128.0-172.16.158.225 172.16.159.255
6. Which type of address is 223.168.17.167/29?
a. host address
b. multicast address
c. broadcast address
d. subnetwork address
Jawaban : b. Multicast address karena IP address tersebut melewati IP address dari kelas C.
7. What is the correct number of usable subnetworks and hosts for the IP network address
192.168.99.0 subnetted with a /29 mask?
a. 6 networks / 32 hosts
b. 14 networks / 14 hosts
c. 30 networks / 6 hosts
d. 62 networks / 2 hosts
Jawaban : c. 30 networks / 6 hosts
25 = 32 networks, 23-2 = 8-2 = 6 hosts.
8. Company XYZ uses a network address of 192.168.4.0. It uses the mask of
255.255.255.224 to create subnets. What is the maximum number of usable hosts in each
subnet?
a. 6
b. 14
c. 30
d. 62
Jawaban : c. 30
224 = 11100000
25-2 = 32-2 = 30 hosts.
9. A company is planning to subnet its network for a maximum of 27 hosts. Which subnet
mask would provide the needed hosts and leave the fewest unused addresses in each subnet?
a. 255.255.255.0
b. 255.255.255.192
c. 255.255.255.224
d. 255.255.255.240
e. 255.255.255.248
Jawaban : c. 255.255.255.224
25-2 = 32-2 = 30 hosts
11111111.11111111.11111111.11100000 = 255.255.255.224
10. An IP network address has been subnetted so that every subnetwork has 14 usable host IP
addresses. What is the appropriate subnet mask for the newly created subnetworks?
a. 255.255.255.128
b. 255.255.255.224
c. 255.255.255.240
d. 255.255.255.248
e. 255.255.255.252
Jawaban : d. 255.255.255.248
24-2 = 16-2 = 14 host
11111111.11111111.11111111.11110000 = 255.255.255.248
11. A company is using a Class B IP addressing scheme and expects to need as many as 100
networks. What is the correct subnet mask to use with the network configuration?
a. 255.255.0.0
b. 255.255.240.0
c. 255.255.254.0
d. 255.255.255.0
e. 255.255.255.128
f. 255.255.255.192
Jawaban : d.255.255.255.0
27 = 128 networks
11111111.11111111.11111111.00000000 = 255.255.255.0
12. Given a host with the IP address 172.32.65.13 and a default subnet mask, to which
network does the host belong?
a. 172.32.65.0
b. 172.32.65.32
c. 172.32.0.0
d. 172.32.32.0
Jawaban : a. 172.32.65.0 karena network tersebut paling mendekati dan tidak melewati IP address diatas.
13. What is the subnetwork number of a host with an IP address of 172.16.210.0/22?
a. 172.16.42.0
b. 172.16.107.0
c. 172.16.208.0
d. 172.16.252.0
e. 172.16.254.0
Jawaban : c. 172.16.208.0
26 = 64
22-2 = 2
172.16.204.0 172.16.205.0-172.16.206.0 172.16.207.0
172.16.208.0 172.16.209.0-172.16.210.0 172.16.211.0
14 Which of the following IP addresses fall into the CIDR block of 115.64.4.0/22? (Choose
three.)
a. 115.64.8.32
b. 115.64.7.64
c. 115.64.6.255
d. 115.64.3.255
e. 115.64.5.128
f. 115.64.12.128
Jawaban : a. 115.64.8.32 , b. 115.64.7.64 ,dan e. 115.64.12.128
Byte ketiga harus lebihn dari angka empat dan byte keempat kelipatan 32.
15. 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
Jawaban : c. 200.10.5.64
24-2 = 14 hosts
200.10.5.0 200.10.5.1-200.10.5.14 200.10.5.16
200.10.5.17 200.10.5.18-200.10.5.31 200.10.5.32
200.10.5.33 200.10.5.34-200.10.5.47 200.10.5.48
200.10.5.49 200.10.5.50-200.10.5.62 200.10.5.63
200.10.5.64 200.10.5.65-200.10.5.72 200.10.5.73
IP address 200.10.5.68/28 berada pada network 200.10.5.64
16. The network address of 172.16.0.0/19 provides how many subnets and hosts?
a. 7 subnets, 30 hosts each
b. 7 subnets, 2046 hosts each
c. 7 subnets, 8190 hosts each
d. 8 subnets, 30 hosts each
e. 8 subnets, 2046 hosts each
f. 8 subnets, 8190 hosts each
Jawaban : f. 8subnets, 8190 hosts each
23 = 8 subnets, 213-2 = 8190 hosts.
17. You need 500 subnets, each with about 100 usable host addresses per subnet. What mask
will you assign using a Class B network address?
a. 255.255.255.252
b. 255.255.255.128
c. 255.255.255.0
d. 255.255.254.0
Jawaban: d. 255.255.254.0
29 = 512 subnet
11111111.11111111.11111110.00000000 = 255.255.254.0
18. What is the subnetwork number of a host with an IP address of 172.16.66.0/21?
a. 172.16.36.0
b. 172.16.48.0
c. 172.16.64.0
d. 172.16.0.0
Jawaban : c. 172.16.64.0
23-2 = 6 hosts/subnet
172.16.0.0 172.16.1.0-172.16.6.0 172.16.7.0
172.16.8.0 172.16.9.0-172.16.14.0 172.16.15.0
..........................................................................................
..........................................................................................
172.16.56.0 172.16.57.0-172.16.62.0 172.16.63.0
172.16.64.0 172.16.65.0-172.16.70.0 172.16.71.0
IP address 172.16.66.0/21 berada pada subnetwork 172.16.64.0
19. What mask would you assign to the network ID of 172.16.0.0 if you needed about 100
subnets with about 500 hosts each?
a. 255.255.255.0
b. 255.255.254.0
c. 255.255.252.0
d. 255.255.0.0
Jawaban : b. 255.255.254.0
27 = 128 subnet, 29-2 = 510 hosts
11111111.11111111.11111110.00000000 = 255.255.254.0
20. You need to configure a server that is on the subnet 192.168.19.24/29. The router has the
first available host address. Which of the following should you assign to the server?
a. 192.168.19.0 255.255.255.0
b. 192.168.19.33 255.255.255.240
c. 192.168.19.26 255.255.255.248
d. 192.168.19.31 255.255.255.248
e. 192.168.19.34 255.255.255.240
Jawaban : c. 192.168.19.26 255.255.255.248
25 = 32 subnets, 23-2 = 6 hosts
11111111.11111111.11111111.11111000 = 255.255.255.248
192.168.19.0 192.168.19.1-192.168.19.6 192.168.19.7
192.168.19.8 192.168.19.9-192.168.19.14 192.168.19.15
192.168.19.16 192.168.19.17-192.168.19.22 192.168.19.23
192.168.19.24 192.168.19.25-192.168.19.30 192.168.19.31
192.168.19.26 berada pada network 192.168.19.24 dan subnet mask 255.255.255.248
21. You need a minimum of 300 subnets with a maximum of 50 hosts per subnet. Which of
the following masks will support the business requirements? (Choose two.)
a. 255.255.255.0
b. 255.255.255.128
c. 255.255.252.0
d. 255.25.255.224
e. 255.255.255.192
f. 255.255.248.0
Jawaban : c. 255.255.252.0 dan f. 255.255.248.0
Karena membutuhkan minimum 300 subnet maka batas byte ketiga yaitu 254.
22. If an Ethernet port on a router were assigned an IP address of 172.16.112.1/25, what
would be the valid 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
Jawaban : a. 172.16.112.0
Karena biasanya untuk subnet address suatu IP address angka nol dan yang tidak termasuk IP yang digunakkan untuk host.
23. Refer to the exhibit. The internetwork in the exhibit has been assigned the IP address
172.20.0.0. What would be the appropriate subnet mask to maximize the number of networks
available for future growth?
a. 255.255.224.0
b. 255.255.240.0
c. 255.255.248.0
d. 255.255.252.0
e. 255.255.254.0
Jawaban : c. 255.255.248.0
210-2 = 1022 host
11111111.11111111.11111000.00000000 = 255.255.248.0
24. You have a network with a subnet of 172.16.17.0/22. Which are 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
Jawaban : e. 172.16.18.255 255.255.252.0
26 = 64
11111111.11111111.11111100.00000000 = 255.255.252.0
25 Your router has the following IP address on Ethernet0: 172.16.112.1/20. How many hosts
can be accommodated on the Ethernet segment?
a. 1024
b. 2046
c. 4094
d. 4096
e. 8190
Jawaban : d. 8190
213-2 = 8192-2 = 8190
26. You have a /27 subnet mask. Which of the following are valid hosts? (Choose three.)
a. 11.244.18.63
b. 90.10.170.93
c. 143.187.16.56
d. 192.168.15.87
e. 200.45.115.159
f. 216.66.11.192
Jawaban : b. 90.10.170.93 , c. 143.187.16.56 ,dan d.192.168.15.87
25-2 = 30 hosts
Karena /27 berada dikelas C IP adrress yang termasuk yaitu 90.10.170.93, 143.187.16.56, 192.168.15.87
27. You have a Class B network ID and need about 450 IP addresses per subnet. What is the
best mask for this network?
a. 255.255.240.0
b. 255.255.248.0
c. 255.255.254.0
d. 255.255.255.0
Jawaban : c. 255.255.254.0
29-2 = 510 hosts/subnet
11111111.11111111.11111110.00000000 = 255.255.254.0
28. Host A is connected to the LAN, but it cannot connect to the Internet. The host
configuration is shown in the exhibit. What are the two problems with this configuration?
(Choose two.)
a. The host subnet mask is incorrect.
b. The host is not configured for subnetting.
c. The default gateway is a network address.
d. The default gateway is on a different network than the host.
Jawaban : c. The default gateway is a network address
Karena default gateway tersebut untuk network address.








