Data Communication: Subnetting and Network Layer

DATA COMMUNICATION
pg. 0

Part 1: Subnetting and network layer
Questions 1
a. The equivalent of the following subnets are as follows.
I. /23 : 255.255.254.0
II. /11 : 255.254.0.0
III. /29 : 255.255.255.248
IV. /31 : 255.255.255.254
b. The maximum number of hosts in given subnets.
I. /19
H= 2^x
x=32-the subnet mask of the network.
32-19=13
2^13
=8192 hosts.
II. /30
32-30=2
2^2
=4 hosts
III. /23
32-23=9
2^9
=512 hosts.
pg. 1

c. Legal and non-legal netmasks.
i. 255.255.240.0 the slash notation is /20
It is a legal IP address
ii. 255.252.255.0
Not a legal subnet mask. When written in binary it is not continuously filled.
iii. 255.192.0.0
it is a legal IP address
Notation /10
iv. 255.255.255.254
It is legal IP address the slash notation is
/31
Question 2 subnetting
a. FLSM 137.111.0.0 will be divided as below using subnet mast /19
255.255.224.0
The table shows all the IP addresses that were subnetted in order using FLSM
Facilities /entities IP address Usable host range Broadcast
Faculty of Arts 137.111.0.0 137.111.0.1 - 137.111.31.254 137.111.31.255
Macquarie
Business School
137.111.32.0 137.111.32.1 - 137.111.63.254 137.111.63.255
Faculty of human
resource
137.111.96.0 137.111.96.1 - 137.111.95.254 137.111.95.255
Faculty of
Medicine and
Health Sciences
137.111.96.0 137.111.96.1 -
137.111.127.254
137.111.127.255
Faculty of 137.111.128.0 137.111.128.1 - 137.111.159.255
pg. 2

Engineering and
Science
137.111.159.254
Macuery
international
college
137.111.160.0 137.111.160.1 -
137.111.191.254
137.111.191.255
Macquarie City
Campus
137.111.192.0 137.111.192.1 -
137.111.223.254
137.111.223.255
b. Extended FLSM scheme to VLSM
Faculty of Arts
137.111.0.0/19
Departmen
t
IP address Range Subnet mask Host
s
Broadcast
1 137.111.0.0 137.111.0.1 -
137.111.1.254
255.255.254.0
/23
510 137.111.1.255
2 137.111.2.0 137.111.0.2 -
137.111.3.254
255.255.254.0
/23
510 137.111.3.255
3 137.111.4.0 137.111.4.1-
137.111.4.254
255.255.255.0
/24
256 137.111.4.255
4 137.111.5.0 137.111.5.1-
137.111.5.254
255.255.255.0
/24
256 137.111.5.255
5 137.111.6.0 137.111.6.1-
137.111.7.254
255.255.254.0
/23
510 137.111.7.255
6 137.111.8.0 137.111.8.1-
137.111.9.254
255.255.254.0
/23
510 137.111.5.255
7 137.111.10.0 137.111.10.1-
137.111.11.254
255.255.254.0
/23
510 137.111.11.255
8 137.111.12.0 137.111.12.1- 255.255.255.0 256 137.111.12.255
pg. 3