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Objective:
- Students understand the concept and implement computer networks with wireless communication media.
- Students are familiar with wireless devices used in computer networks.
- Students are able to design network topology using wireless LAN components.
- Students are able to configure wireless LAN using packet tracer
(Computer, 2011) Wireless or wireless is one of the media connecting nodes in a network that is not visible in form. By using wireless, computer networks will have many advantages because there are no cables hanging around and often create a messy atmosphere.
Based on the criteria, wireless can be divided into 5 parts as follows.
- Wireless PAN (Personal Area Network), connected to wireless media. The application of this technology system is usually found in Bluetooth and IrDA.
- Wireless LAN (Local Area Network), connected with wireless media. The application of this technology system is based on forming a computer network that may not be reachable by a network that uses cables.
- Wireless Card, connected to the network media using a card. The application of this technology system is usually often found in notebooks called PCMCIA (Personal Computer Memory Card International Association).
- Wireless Modem, a modem that is connected to a network media without cables.
- Wireless Bitmap, connected to the network media with graphic format contained in WAP. Generally, the implementation of this technology system will slow down data transfer because of its large size.
A. Wireless LAN
According to Siswanto (2011), a wireless local area network or WLAN is a wireless local area network where the transmission media uses radio frequency (RF) and infrared (IR) to provide a network connection to all users in the surrounding area.
The coverage area can be from a classroom to an entire campus or from one office to another and in different buildings. Devices commonly used for WLAN networks include PCs, laptops, PDAs, mobile phones, and so on. WLAN technology has many uses. For example, mobile users can use their mobile phones to access e-mail. Meanwhile, travelers with their laptops can connect to the internet when they are at airports, cafes, trains and other public places.
1. Advantages and Disadvantages in Wireless LAN implementation
a. Advantages
High Mobility and Productivity, WLAN allows clients to access information in real time as long as it is within the WLAN range, thus improving the quality of service and productivity. Users can work wherever they are as long as the location is within the WLAN coverage area.
Ease and speed of installation, because the infrastructure does not require cables, installation is very easy and quick to carry out, without the need to pull or install cables on walls or floors.
Flexible, with WLAN technology it is very possible to build networks in areas that are impossible or difficult to reach by cables, for example in big cities, in places where cable infrastructure is not available.
Lowering the cost of ownership, with one access point being able to cover the entire area and the maintenance costs are cheap (only covers cell stations, not like a cable network which covers the entire cable).
b. Weaknesses
High equipment costs (this weakness can be eliminated by developing and producing electronic component technology so as to reduce network costs).
Large delays, radio propagation problems such as obstruction, reflection and many sources of interference (these weaknesses can be overcome with modulation techniques, antenna diversity techniques, spread spectrum techniques, etc.).
Network capacity faces spectrum limitations (frequency bands cannot be widened but can be utilized efficiently with the help of various techniques such as spread spectrum/DS-CDMA) and data security (confidentiality) is less guaranteed (this weakness can be overcome, for example, with spread spectrum techniques).
B. Practical Steps
Access Point
1]. Prepare 3 PC-PT, 1 Laptop, 1 switch, 1 Server and 1 Access Point.
2]. Assemble all the equipment to form a network topology
3]. Set DHCP Server on Server0 with network 192.168.10.0/24
4]. Set PC-PT and Laptop to Wireless PC.
5]. Create a wireless connection between PC-Wireless, Laptop and Access Point
6]. Connection Test
Wireless Router
1]. Prepare several PCs and create a network topology like the one below.
2]. Do Wireless Router settings
3]. Check Connection
C. Evaluation
Please experiment using the following topology.
Bibliography
Computer, W, 2011, Network Administration with Linux Ubuntu 11, Andi Publisher, Yogyakarta. Siswanto, Joko, 2011, Computer Network and Data Communication Practical Module, STMIK El Rahma, Yogyakarta.