ICT106 Data Communications and Networks

ICT106 DATA
COMMUNICATIONS
AND NETWORKS
NAME OF THE STUDENT
NAME OF THE UNIVERSITY

INTRODUCTION
• XYZ company have its main office in Sydney and the other
two remote office in Melbourne and Adelaide. The main aim
of the report is allocation of unreserved public IPv4 address
to the offices located in different geographical location. A
design and explanation of the LAN for the office is
presented and a discussion is made on the LAN topology
for the selection of the particular topology.

IP ADDRESSING PLAN
Subnet
Name
Needed Size Allocated
Size
Address Mask Dec Mask Assignable
Range
Broadcast
Subnet A
Sydney
63 126 17.5.6.0 /25 255.255.255.
128
17.5.6.1 -
17.5.6.126
17.5.6.127
Subnet B
Melbourne
53 62 17.5.6.128 /26 255.255.255.
192
17.5.6.129 -
17.5.6.190
17.5.6.191
Subnet C
Adelaide
43 62 17.5.6.192 /26 255.255.255.
192
17.5.6.193 -
17.5.6.254
17.5.6.255
Subnet D 2 2 17.5.7.0 /30 255.255.255.
252
17.5.7.1 -
17.5.7.2
17.5.7.3

LOCAL AREA NETWORK DESIGN

NETWORK DESIGN JUSTIFICATION
• The LAN is designed such that the computer and the
servers are kept in different subnet such that the security
of the network is maintained. For each of the location
different routers are used and similar topology is followed
each of the office for decreasing the complication of the
network design.

LAN TOPOLOGY
• The network is developed following the three layer hierarchical
design topology such that the scalability, reliability and availability
of the network can be improved. This type of topology finds its
application for small, medium and large scale enterprise network
and the designed can be tailored based on the change in needs of
the organization. For a small network as for the branch office less
number of distribution level devices are needed and it can be
increased with the increase in number of users in the branch.

LAN PROTOCOLS
• The layer 3 switch is configured with VLAN based on the number
of department in each of the branch or head office. The layer 2
device connected with the layer 3 switch is configured as client
for automatically getting the VLAN information and allow access
of the subnet for that department. The core device is configured
with VTP protocol such that it can share the VLAN information
with the connected client devices and reduces the complexity if
any change is needed to be made in the network.

HARDWARE REQUIREMENT
Device Name Features and Ports Cost
Cisco 2811 Series integrated
service router
Embedded Ga or Fa port,
AUX and Console Port
US$2,495.00
Cisco Catalyst WS-C2950S 24 Fast Ethernet ports
VLAN Support
US$949.99
Cisco WS-C3524-XL-EN 3500 24 Fast Ethernet port
2 Gigabit Ethernet port
VLAN Support
US$2995.0

CONCLUSION
• Development of the subnet plan for the XYZ company can help in
increasing the efficiency of usability of the IP address. A design of
the LAN is created after analyzing the number of hosts that are
needed to be connected per subnet. The application usage and
the inter department data transfer needs is also analyzed for the
development of the network. The wireless access that is needed
to be maintained for the user and the communication needs is
analyzed for the development of the network.

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