S SP PE E The best way to learn subnetting is through practice. Answer the following questions regarding IP address classes and subnetting: 1.How many IP classes are available? __________________________________________________________________

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EECB423 Subnetting Practice Worksheet JEJ2010
1

S
S
U
U
B
B
N
N
E
E
T
T
T
T
I
I
N
N
G
G


P
P
R
R
A
A
C
C
T
T
I
I
C
C
E
E


E
E
X
X
E
E
R
R
C
C
I
I
S
S
E
E



The best way to learn subnetting is through practice. Answer the following questions
regarding IP address classes and subnetting:
1. How many IP classes are available?
__________________________________________________________________

2. Of these classes, how many are commercial classes?
__________________________________________________________________

3. Describe the following IP classes by showing network (n) and host (h) octets in
dotted-decimal format.

Class A:___________________________________________________________
Class B:___________________________________________________________
Class C:___________________________________________________________

4. What is the range of Class A IP addresses?
__________________________________________________________________
__________________________________________________________________

5. What is the default mask for a Class A network?
__________________________________________________________________

6. What is the range of Class B IP addresses?
__________________________________________________________________

7. What is the default subnet mask for a Class B network?
__________________________________________________________________

8. What is the range of Class C IP addresses?
__________________________________________________________________

9. What is the default subnet mask for a Class C network?
__________________________________________________________________

10. What is the minimum number of bits that can be borrowed to create subnets?
__________________________________________________________________

11. What is the maximum number of bits that can be borrowed from a Class B
network to create subnets?
__________________________________________________________________
EECB423 Subnetting Practice Worksheet JEJ2010
2

12. If 4 bits are borrowed from a Class C address, how many usable subnets can be
created? What is the subnet mask?
__________________________________________________________________

13. If 4 bits are borrowed from a Class A address, how many usable subnets can be
created? What is the subnet mask?
__________________________________________________________________

14. If 8 bits are borrowed from a Class B address, how many usable subnets can be
created? What is the subnet mask?
__________________________________________________________________

15. If 13 bits are borrowed from a Class C address, how many usable subnets can be
created? What is the subnet mask?
__________________________________________________________________

16. If 4 bits are borrowed from a Class C address to create subnets, how many usable
hosts can be placed on each subnet?
__________________________________________________________________

17. If 4 bits are borrowed from a Class B address to create subnets, how many usable
hosts can be placed on each subnet?
__________________________________________________________________

18. How many usable hosts can be placed on a Class C network (not subnetted)?
__________________________________________________________________

19. Seven usable subnets are needed for a Class C network. What is the subnet mask?
__________________________________________________________________

20. Thirty-three usable subnets are needed for a Class B network. What is the subnet
mask?
__________________________________________________________________

21. Sixty-one usable subnets are needed for a Class C network. How many usable
hosts can be placed on each subnet?
__________________________________________________________________

22. Seventy-seven usable subnets are needed for network 190.22.0.0. What is the
subnet mask? How many usable hosts can be placed on each subnet?
__________________________________________________________________

EECB423 Subnetting Practice Worksheet JEJ2010
3

23. Fifty usable subnets are needed for network 192.2.8.0. What is the subnet mask?
What is the subnet address of usable subnet #3 and usable subnet#4? How many
usable hosts can be placed on each subnet?
__________________________________________________________________
__________________________________________________________________

24. Twelve bits are borrowed to subnet network 129.3.0.0. What is the broadcast
address of usable subnet#2 and usable subnet#6?
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________

25. Three bits are borrowed to subnet network 207.98.6.0. What is the subnet mask?
How many usable hosts can be placed on each subnet? What is the first
assignable IP address subnet#1 and subnet#2?
__________________________________________________________________

26. You need to subnet network 178.99.0.0 so 4000 hosts can be placed on at least 13
subnets. What is your subnet mask?
__________________________________________________________________

27. You are the network administrator of a rapidly growing company. Your first job
is to subnet the company’s network (133.9.0.0) so it meets future demands.
Today, the company has need for 99 usable subnets. What is the subnet mask if
you allow for 300 percent growth in the future? How many hosts can be placed
on each subnet?
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________