Logical and Physical Network Design | Report

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Summary
Network and communication describe the interconnection of computing devices
for the purpose of communication of the interconnected devices. This basically
what networking is all about? In the networking arena, there are fundamentals
which have to be fulfilled for a networking to be considered complete. These
fundamentals include the message sender, message recipient, the path with
which message follows through, the message itself and finally the protocol which
dictates on how the messages will be delivered. A complete network
environment must entail the mentioned above.
For the messages to send to correct recipients, there must an identification
scheme which tells the sending device that this message will be delivered to a
certain device on the network or internet but not any other device. Furthermore,
even the recipient has to send a reply to the sender either replying the message
or acknowledging the receipt of the message send. The recipient too must have
a way to identify the sender of the message.
Either way, the scheme to identify both the sender and recipient of a message
on the network and internet is IP addressing. An IP address can be defined as a
numerical number or label which is assigned to a networking device linked to a
computer network which uses the IP for the reasons of communication. The IP
addresses serves two primary roles. That is, location addressing and network
interface or host identification. IP addresses are assigned to individuals and
organisations by Internet Service Providers. The ISPs are provided these IP
addresses by IANA. Once an IP address has been assigned to an organisation, it
has to be subdivided into segments which suite organisation needs.

Table of Contents
Summary............................................................................................................... 2
1. Introduction....................................................................................................... 4
1.1 Scope............................................................................................................ 4
1.2 The usefulness of logical diagram................................................................4
2. Organisational Description................................................................................5
3. Address allocation plan for each subnet............................................................5
3.1.2 IPv4 allocation plan for Branch A.............................................................10
3.1.3 IPv4 allocation plan for Branch B.............................................................10
3.1.4 IPv4 allocation plan for Branch C.............................................................10
3.2.2 Branch A.................................................................................................. 11
3.2.3 Branch B.................................................................................................. 11
3.2.3 Branch C.................................................................................................. 12
4. Conclusions...................................................................................................... 13
5. References....................................................................................................... 14

1. Introduction
1.1 Scope
The primary reason for this task is to perform a logical and physical network
design for a company having three branches. This will entail designing a logical
and physical network diagram for this company. The network diagrams are key
to the effectiveness of the network and the information technology management
for the company.
With the up-to-date network diagram, our client’s network administrators will be
able troubleshoot minimizing the downtime, plan for the network capacity, evade
Information Technology clutter, maintain the network software, and keep the
network compliant and secure. The physical network diagram will depict the
physical topology of our client’s network and how the physical network devices
are linked. For the logical diagram for biomedical software Development
Company, it will depict how information in this network will be flowing. In the
logical network topology, we will visualize elements such as subnets (VLAN IDs,
IP addresses and subnet masks), network devices (firewalls, switches and
routers), specified routing protocols, the routing domains, traffic flows and the
network segments.
1.2 The usefulness of logical diagram
Since the information contained in a logical network diagram corresponds to the
layer 3 (L3) of the OSI model, the layer 2 network devices which include the
switches are not visualized in a layer 3 logical diagram. The logical network
diagram will make the management of network in the following mentioned ways;
i. Sharing of the network information – if our client network admins need
to share information concerning the network concealing the physical
information, the admins will use the designed logical network diagram.
ii. Capacity planning – both the logical and physical diagrams are very
instrumental in capacity planning. Having these diagrams, the network
admins can map out expanding and changing the network and
visualize what will impact what on the network.