Virtual Private Network (VPN) Project Report

Wireless Communication
Introduction
The term "wireless" has become a generic and all-encompassing word used to describe communications in which electromagnetic waves or RF (rather than some form of wire) carry a signal over part or the entire communication path.
It is the transfer of information over a distance without the use of electrical conductors or "wires".
The distances involved may be short (a few meters as in television remote control) or long (thousands or millions of kilometers for radio communications). When the context is clear, the term is often shortened to "wireless". Wireless communication is generally considered to be a branch of telecommunications.

Examples
It encompasses various types of fixed, mobile, and portable two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of wireless technology include GPS units, garage door openers and or garage doors, wireless computer peripherals ( like mice, keyboards and headsets ), satellite television, wireless gaming and cordless telephones.

Modes of Wireless Communication
Wireless communication can be via:
• radio frequency communication,
• microwave communication, for example long-range line-of-sight via highly directional antennas, or short-range communication, or
• infrared (IR) short-range communication, for example from remote controls or via Infrared Data Association (IrDA).

Applications
Applications may involve point-to-point communication, point-to-multipoint communication, broadcasting, cellular networks and other wireless networks.
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Project Report on Visual Basic

OBJECTIVE & SCOPE OF PROJECT
The main objective of this project is that to minimize the handwritten work to small as possible and provide user an automated environment in which he/she can work efficiently and also in user friendly environment.

The scope of the project generally lies at the places like schools , colleges & universities where faculties attendance maintenance are major requirement because on basis of this the salary of person can be calculated, this project is on very small basis means to say not on big scale we can implement it on bigger scale in form of maintaining student attendance ,apart from this the same concept can be applied in various business firms (public and private) which are fully automated with computer and the company has to maintain the regularity of employers also at these places it is not possible to maintain large records files which require a separate room for storage so to avoid this we made this software in which database are maintained which cover very less space then the space taken by files etc.

THEORETICAL BACKGROUND
Why VB (Visual Basic)?
Visual basic is one of the most popular programming languages in the market today. Microsoft has positioned it to fit multiple purposes in development. The language ranges from light weight vb script programming, to application specific programming with vb for applications

What is Visual Basic?
The visual part refers to the method used to create GUI.Rather then writing numerous lines of code to describe the appearance and location of interface elements , we simplify add rebuilt objects into place on screens.

VB is high level programming language evolved from earlier DOS version called BASIC. VB is event driven programming VB programs are made up of many sub programs , each has its in own program codes and each can be executed independently and at the sane time each can be linked in one way or another.

VB is designed to deploy applications across the enterprise and to scale of any size needed the ability to develop object mode is databases integration, server components, and Internet/Intranet applications provides an extensive range of capabilities and tools of the developer. In particular VB lets us to add menus, textboxes, command buttons, option buttons, check boxes, scroll bars, and file & directory boxes to blank windows. We can communicate with other window applications and perhaps most importantly we will have an easy method to let users’ control and access database.
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Voice Over IP (VOIP) Project Report

LIST OF CONTENTS
1. Introduction: VoIP
2. VoIP Architecture and Protocol Stack
3. VoIP configurations
4. Requirements, Availability, and Service Limitations
5. Introduction: Session Initiation Protocol (SIP)
6. Short History of SIP
7. Overview of Services Provided by SIP Servers
8. SIP Enabled Network
9. Threats and Risks
10. How to Protect Against Risks
11. References

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