ITN 101 Worksheet

calvesnorthNetworking and Communications

Oct 24, 2013 (3 years and 7 months ago)

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ITN 101 Worksheet


This assignment covers Internet addressing, specifically subnetting. A subnet is a dividing the IP address NOT along the Cla
ss A, B, or C
boundaries (i.e. not along the 8 bit groups). To perform subnetting you also need to understand binary number conver
sion. For the work sheet
you will need to show all work, even with the number system conversions.

Examples:

Convert 10110011
2

to decimal.


1 x 2^8


1 x 128


128


0 x 2^7


0 x 64


0


1 x 2^6


1 x 32


32


1 x 2^5


1 x 16


16


0 x 2^4


0 x 8


0


0 x 2^
3


0 x 4


0


1 x 2^3


1 x 2


2


1 x 2^1


1 x 1


1






179
10




Convert 153
10

to binary

(There’s more than one algorithm, use what you want!)
.






Remainder

Answer
-

10011001

2

153













2

76


1











2

38


0











2

19


0











2

9


1











2

4


1











2

2


0











2

1


0











2

0


1






Apply a Subnet Mask to an IP Address to get the network address (using logical AND of the binary versions of the address).


IP Address

1

1

0

1

0

0

0

0

.

0

0

0

0

0

0

1

1

.

1

0

1

0

1

0

1

0

.

1

1

1

1

0

1

1

0

Subnet Mask

1

1

1

1

1

1

1

1



1

1

1

1

1

1

1

1



1

1

1

1

1

1

1

1



1

1

1

0

0

0

0

0

Network
Address

1

1

0

1

0

0

0

0

.

0

0

0

0

0

0

1

1

.

1

0

1

0

1

0

1

0

.

1

1

1

0

0

0

0

0



A subnet uses a specific number of bits for the network and host IDS, not just the 8 bit boundaries. So in the previous exam
ple, the subnet mask
is specifying a network ID of 27 bits and a host ID of 5 bits. This network will be able to handle 2^5
-
2 or 1
4 hosts. Read chapter 11 again, if
necessary.


Assignment. SHOW ALL WORK!!!!


Convert these numbers to decimal

(10 points each)
-



00110011
2



10111011
2


Convert these numbers to binary (your answer should have 8 bits)

(10 points each)
-



24
10



247
10




What is the network address of the following IP addresses using the mask provided

(10 points each)
-



129.44.21.118


255.255.255.240


176.0.222.34


255.255.248.0


You are given a network address of 147.47.74.0. For each set of constraints given
explain to your boss
(me) the largest number of subnets possible, and the largest number of hosts per subnet. For example,
at the extremes, 8 bits might allow 2 networks with 126 hosts, or 64 networks with 2 hosts per network.
(20 points each)
-



Your bo
ss currently has 4 departments with no more than 10 machines per department.

What
are the options for subnetting your given network address (i.e. how many
subnetworks with
how many hosts). Hint
-

there will be more than 1 combination, give them all.


Y
our boss decides to allow for future growth. She figures that she will never have more than 24
machines in one group (i.e. no more than 24 hosts on a single subnet). She wants to know how
many groups (i.e. subnetworks) she will be able to have in the fut
ure. What network mask must
you use to provide for subnets with no more than 24 machines? How many subnets will be
allowed?