3.4 LAN
Installation
These are in term of ease of installation, total cost,
reliability, performance and security as state from Mitchell (2007). The
article said that wired LAN use Ethernet cables and network adapters. Although
two computers can be directly wiredto each other using an Ethernet crossover
cable or different devices can be connected using straight through cable, wired
LAN generally also require centraldevices like hubs, switches, or routers to
accommodate more computers. In term ofinstallation, wired LAN used an Ethernet
cables. The cable must be run from eachcomputer to another computer or to the
central device. It can be time-consuming anddifficult to run cables under the
floor or through walls, especially when computers sit inDifferent rooms.
3.5 LAN
Security
Without adequate protection or network security, many
individuals, businesses, and governments are at risk of losing that asset.
Network security is the process by which digital .Network security is the
process by which digital information assets are protected, the goals security
are to protect confidentiality, maintain integrity, and assure availability.
(Salah Alabady, 2009)With the current increase number of LANs and personal
computers security has become very critical issues when it comes to protect
users, asserts and privacy of users.Security has one purpose, to protect
assets. With the advent of personal computers, LANs, and the wide-open world of
the Internet, the networks of today are more open.
CHAPTER FOUR: SYSTEM ANALYSIS
2. Introduction
A system analysis involves evaluation of the current system
using the gathered facts or information. System analysis involves
understanding and specifying in detail what the system will do. One should
evaluate whether the current and projected user needs are being met. If not,
he should give a recommendation of what is to be done. Analysis involves
detailed assessment of the components of the existing system and the
requirements of the system.
The objectives or aims of system analysis are:
Ø To determine information needs of an organization and
the users of that information.
Ø Determination of the current activities of the system
i.e. functions involved in conversation of inputs to outputs.
Ø Determination of the intended systems output.
Ø Determination of the resources required for the
intended system.
Ø Determination of capabilities required in the system
to meet information needs of the organization.
4.1 System analysis activities
i) Analysis of the organization environment.
The analyst should evaluate in details information needs of the organization
environment e.g. information needs of the consumers, suppliers, competitors,
government departments etc.
ii) Analysis of the present system. The
analyst should study the current system and identify its weaknesses and its
strengths. He should establish the ability of current system in meeting the
stated information needs. This guides a decision to be made on whether the
existing system stands to be improved, changed or done away with altogether.
Some aspects of the existing controls, files, user interaction, methods,
procedures, functions and existing hardware and software.
iii) Requirement analysis - involves
determination of user requirements e.g. tasks performed, output expected,
proposed system development cycle and user goals.
The following are also determined:-
ü Maximum, minimum and average levels of activities.
ü Labor intensive tasks - the tasks that are manual and
can easily computerized.
ü Activities or tasks that involve complex or repetitive
computation.
ü Procedures that have become obsolete.
Once all the facts are analyzed and documented a formal report
is written called statement of requirements.
4.1.0 The
importance of system analysis:
i) It helps the analyst or system developer to gain
understanding of the existing system.
ii) It allows the analyst or system developer to record
existing system information in a standard form to aid design of a new system.
It also facilitates understanding of the system by the user staff.
iii) Enables the analyst or developer to define existing
system procedure into a logical model.
Helps the analyst to write or produce statement of requirements,
which guides the development team throughout subsequent stages of the
development life cycle.
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