SSM DELL Project Management SSM Australia Network Design

Executive Summary
SSM Australia is planning to incorporate a network set up configuration within
their premises. Working for the AusNet networking solution provider, the team is
asked to design a network solution for the requirements specified by the Seven
Star Motors (SSM) Australia and test it using GNS3 emulation platform before
deploying the real network and document the specifications.

Contents
Introduction........................................................................................................... 3
Requirements for branches – Functional / non functional......................................3
Topology – Design................................................................................................. 4
Design a network solution..................................................................................... 4
Sydney – Head office............................................................................................. 6
Configurations: Basic configuration.......................................................................8
Switching Configuration......................................................................................... 9
Routing Protocols................................................................................................. 10
NAT................................................................................................................... 12
Restricted Cone NAT...................................................................................... 12
Port-restricted cone based NAT.....................................................................13
Symmetric NAT.............................................................................................. 14
Leased line....................................................................................................... 15
Security (SSH and Port Security).........................................................................15
Conclusions.......................................................................................................... 16
References........................................................................................................... 17
Introduction
SSM Australia maintains, hires out, buys and sells new and used premium
branded motor vehicles in Australia. The head office of the company is situated

in Sydney. The branches are located in Melbourne, Perth and Brisbane. Company
wants to implement a network that can support a potential growth over the next
five years and they have to hire AusNet in order to layout the network with an
expectation of 50% growth of current IP requirements.
Currently there are 125 employees at department of Sales and Hire, 45
employees in department of Marketing, 20 employees within department of
Vehicle Maintenance, 25 employees at the department of Business
Administration and 5 employees at department of Site Security by providing their
service to the head office which is also stationed in Sydney (Akyildiz Melodia &
Chowdhury, 2008). All members of the department within Site Security required
accessing the entire network via a wireless LAN at each site. Company has their
20 employees working for the Technical Support Group, 5 employees at each
site. Sydney head office also has hosts the server farm for the network. These
servers are containing in web servers and file servers from which it carries
company sensitive information.
Requirements for branches – Functional / non functional
The connection between the nodes and the bus cable are known as drop line. It
is very use to understand and install also. It requires very less number of cables
and inexpensive. It is very slow and traffic is so high. The next one is the ring
topology where the nodes are connected in the ring or circular form. All the
computers are connected in the form of circle. Every computer will act as a
repeater in the system. Here we cannot see any termination as the topology is in
the form of ring. The hardware requirement is very less. The troubleshooting is
very difficult in this system. If one computer is troubled then entire system will
collapse. It is not easy to add or removes a computer from the system. The next
topology is star topology, where devices are connected with cable to a
centralised hub (Alabady, 2008). The packets of data are transferred to other
computer through a hub. These require huge number of cables. If hub fails entire
system fails. This is very costly. The next one is the hybrid topology. The hybrid
topology is combination of all topology. The work efficiency is high and the traffic
is maintained properly. Here the hardware complexity is there.

Topology – Design
The topology is the way how the connections are made in the network. The first
type of connection is the point to point connection. The best example of this kind
is the computers connecting with the modem in both the direction. The next kind
of example is the work stations connected in parallel through same cable. In
point to point communication there are three types of connections. They are
simplex, half duplex and full duplex. The simplex connection is the basic
connection in which point can only transmit the data or receive the data. The
next one is the half duplex. The half duplex is one which the data can be
transmitted and received in both the ways. But it cannot be done simultaneously.
It can do one operation at a time only. When it is transmitting data it will not
receive, similarly the opposite also. The next one is the full duplex mode. The full
duplex mode is one which data can be transmitted and received simultaneously.
This is the fastest way of communication. The next one is the multipoint
communication. In this three or more devices are connected in the same line.
The best multi point topologies are bus topology, ring topology and the mesh
topology (Ali & Alabady, 2007). The bus topology is one which has one cable and
this called as trunk. This truck will help to transfer the packets of data to all
computers connected in the bus network. Generally the bus topology is called as
the passive topology. This is suitable for very less computers. When the number
of computers added the network will not work properly. The number of
computers must be limited. There should be terminators at the end of the
terminals to avoid the signal bounce back. The length of the bus can be
increased by using barrel connectors. The signals must be regenerated and for
this function some repeaters are used. This bus network is used for the
temporary purpose. It is not used for the long term purpose. It can be limited for
10 people. If the cable has problem then the entire system will not function.
Hence it is not suitable for long term basis (Downes, Rad & Aghajan, 2006).
Design a network solution

Typical network connection will have the following aspects. The network
Topology is one which tells how the elements in the network are mapped from
one point to the other point. The physical topology of the network is associated
with the cables, connectors and the computers. The different types of the
network topologies are listed below, they are bus topology, ring topology, star
topology, mesh topology, tree topology and the hybrid topology. The bus
topology is one which the nodes of the network are connected by a single wire.
This wire is called as a linear wire. Bus topology are easy to build and very
inexpensive. The main advantage is that it requires less cable. This topology is
much suited for the small areas only. The disadvantage is that it supports only
small area and limited systems. The next topology is the ring topology in which it
has ring shape with each node has two neighbours (Esteve & Esteve, 2010).
Ring topology it uses the token ring system. It is easy to manage than the bus
system. It is used for the long distance communication and it handles very high
traffic. The main disadvantage of the system is that if one node fails to work then
entire system is collapsed. The next topology is the star topology in which each
device is connected to the centralized device known as the hub. The data flows
from the hub to switch, switch to connector, connector to the node. It is easy to
manage the problem can be located very easily. It is very easy to install
compared with the other two. The main disadvantage of this is that it requires
more cable length. It is more expensive because of the connectors. If hub fails