Connecting Two Campus Site Using Wireless Lan Computer Science Essay

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Wireless Local Area Network which is also known as Local Area Wireless Network is a network in which a mobile user using wireless computing devices is connected local area network using a wireless radio connection. Wireless LANs are specified by using IEEE 802.11. IEEE 802.11 uses CSMA (Carrier Sense Multiple Access) or CA (Collision Avoidance) and Ethernet protocol for the purpose of sharing the path and it also uses Wired Equivalent Privacy algorithm (WEP) for encryption. [Mobilecomputing.com, 2010]

In Wireless LAN allocation of the high bandwidth to wireless is an advantage that makes possible to reduce cost incurred in the wiring of the system. Few other advantages of the system include, WLAN provides more comfort and convenience to the users as user can access the network from any location within the range; mobility is allowed in WLAN; deployment of the WLAN is easy when it is compared with wired. WLAN also has few challenges that are to be planned and resolved. These challenges include security, range, reliability, and speed and energy consumption. [Mobilecomputing.com, 2010]

Different Scenarios where WLAN is used:

As mentioned in the definition of the WLAN, it is mostly applicable in the areas where mobility of the user is given preference. It can be a home, college, work place, or a hotel or resort. All the areas mentioned above are using mostly WLAN to get connected to the LAN. This has increased because of the increase in the usage of mobile computing devices such as laptops and net books. The scenario chosen by me among all above areas of application is for college application.

Wireless LAN: Scenario

The network designed is a campus network which user's three subnets to use three access points to connect with each other. The three subnets are named as campus 1, campus to and server. Campus 1 and campus 2 are allotted an access point each in their subnet. Campus 1 and Campus 2 has WLAN fixed outer each which are used to provide connection between mobile user and the server present in the server subnet. Server subnet contains a server and a communication switch which is connected to the campus 1 router and campus 2 routers.

This project deals with two scenarios of the network designed which include network with normal traffic and network scenario where traffic is scaled 50% more than normal traffic. Network structure for both scenarios is same but network load is 50% increase for scenario 2. The main aim of the project is to critically analyse the simulation results and to compare the results of the first scenario with second scenario.

Scenario Description:

Campus 1 and Campus 2: Both campuses have access point each and few wireless nodes or computer system1.

Server Node: Server contains a switch and main server.

The network developed uses three applications including email, http, and ftp.

Two profiles are defined to use the applications which include student and staff

In the second scenario all description details are same as first scenario but only change made is traffic is scaled up by 50% when compared to first scenario.

Requirement Analysis:

To design a Wireless LAN according to the scenario detailed above we require:

Two access points (wireless routers can be used for this purpose)

Wireless computers (Minimum 2 computers for campus)

Server (basic server 1)

A Switch

Quality of service requirements include:

Coverage of the access points used in campus 1 and campus2 should be good enough to provide application services to the users

System should have minimum drop rate and

It should have maximum throughput

Design of WLAN:

Network Diagram:

Fig. Main Network

Internal structure of Subnets:

Fig. Campus 1 Fig. Campus2

As mentioned in the requirement analysis Campus1 and campus2 have very similar structure with 2 access points.

Fig. Server Node internal Structure

Using a switch campus1 subnet and campus2 subnet are connected the main server and application configurations and profile configurations are set for the network

Application and Profile Configurations:

Simulation Results:

First Scenario: Normal Traffic

WLAN Global Stats

Inference: from the above graph it is evident that 'Delay' of WLAN is 0 for 2 minutes in the initial stage and then it increased to 0.0040 seconds and become stable there. WLAN Load and Throughput as almost same here and these values are also 0 for a couple of minutes and then increased and crossed 1,50,000 bit/sec mark and reduced and ended at around 50,000 bits/Sec

WLAN Individual Stats

Inference: from the above graph it is evident that 'Delay' of WLAN is 0 for few minutes in the initial stage and then it increased to 0.0030 seconds and ended slightly above. WLAN Load's maximum values is around 8000 bits/sec and it ended at around 2000 bits/sec and Throughput's maximum values is around 10000 bits/sec and it ended at around 2500 bits/sec

Second Scenario: Scaled Traffic

WLAN Global Stats

Inference: from the above graph it is evident that 'Delay' of WLAN is 0 for 2 minutes in the initial stage and then it increased to 0.0040 seconds and ended over 0.0040secs. When it is compared with Scenario 1, most of the time graph is over 0.0040sec after increasing to that 0.0040sec mark. WLAN Load and Throughput as almost same here and these values are also 0 for a couple of minutes and then increased and crossed 1,50,000 bit/sec mark and reduced and ended at around 50,000 bits/Sec, but is almost touching 50,000 mark when compared to Scenario 1.

WLAN Individual Stats

Inference: from the above graph it is evident that 'Delay' of WLAN is 0 for few minutes in the initial stage and then it increased to 0.0030 seconds and ended slightly above. WLAN Load's maximum values is around 8000 bits/sec and it ended at around 2000 bits/sec and Throughput's maximum values is around 10000 bits/sec and it ended at around 2500 bits/sec. According to the graphs observed no change is observer for Object stats of the Student computer 1 in the campus1. So, here no change is observed in graphs.

Conclusion:

Wireless Local Area Network is a network in which a mobile user using wireless computing devices is connected local area network using a wireless radio connection. It offers several advantages such as convenience to the users, easy deployment of the network, etc. WLAN also has challenges such as security, range, reliability, and speed and energy consumption. From the above network simulation and observation on it conveys that increase in the traffic shows its positive impact on the delay, throughput and load of the network.

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