2.30. 5.3.3 Network security and
management design
Network security involved the implementation of the following
services;
ü Port shut down: this service allow to shut unused port of
the switch, the purpose is block any sniffing by unauthorized users.
ü Implementation of switch and router authentication and
identification which allows only authorized user to access, make changes and
make configuration at remote location or locally.
ü Implementation of access list control to assign privilege
to authorized uses to access and perform task according to privilege
assigned.
Management design involve the following services;
ü Creation of web based application to deal with request of
users and provide them solution.
ü Implementation of secured telnet of all switches in
network to allow easy troubleshooting and maintenance.
2.31. 5.4.0 System design of Jkuat
network management online
2.32. 5.4.0.1 Introduction
System Design is a process of designing how the intended
system will look like once it becomes operational. It is meant to produce a
design specification for the new system.
In system design, I specified in detail how the parts of the
system would be implemented.
I used the Object Oriented Analysis and Design (OOAD)
approach. This is because it provides a way of thinking about a problem using
real world concepts instead of using adhoc function concepts.
The major benefits of using OOAD are:
i) It promotes better understanding of user requirements.
ii) It leads to cleaner designs.
iii) There is design flexibility.
iv) Decomposition of the system is consistent.
v) Software can be reused.
vi) It facilitates easy maintenance.
vii) There is implementation flexibility
The object oriented (OO) methodology has 3 elements namely;
notation, process and Tools.
a) Notation
This is a collection of graphical symbols for expressing the
model of the system.
The Unified Modeling Language (UML) provides a very robust set
of notation which grows from analysis to design.
The UML is mainly a collection of graphical notations that
methods use to express the designs.
The UML is also used for visualizing, specifying,
constructing, and documenting the artifacts of a software system.
The advantages of UML are that:
i) It captures the business processes.
ii) It enhances communication and ensures the right
communication.
iii) It has the capability to capture the logical architecture
independent of the implementation language.
iv) It enables reuse of design.
The UML refers to things like classes, components,
relationships, packages, etc.
b) Process / Method
A process is an extensive set of guidelines that addresses the
technical and organizational aspects of software development focusing on
requirements, analysis and design.
Process basically encapsulates the activities leading to the
orderly construction of a system model.
c) Tools.
A tool is automated support for every stage of the SDLC.
It helps the designer in creating designs much more
quickly.
Tools support validations like consistency checking,
completeness checking and constraint checking.
Tools also help in code generation, reverse engineering, round
trip engineering, conversion from SSAD to OOAD, quick documentation, etc.
The tools used included UMLDiagrammer, White star UML and
Microsoft Visio 2013.
Models Object Oriented Development
There are 4 + 1 views of the OO model. These views are:
o The process view
o Deployment View
o Logical View
o Dynamic View +
o Use Case View
For each dimension, a number of diagrams are defined that
denote a view of the system's model.
The use case is central since its contents drive the
development of other views.
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