Wireless LAN’s | Computer Networks - Computer Science Engineering (CSE) PDF Download
WIRELESS LAN’S
Wireless technologies differ in variety of dimensions, most notably in how much bandwidth they provide and how far apart communicating nodes can be. Other important differences include which part of the electromagnetic spectrum they use (including whether it requires a license) and how much power they consume. Four prominent wireless technologies:
- Blue tooth
- Wi-Fi(more formally known as 802.11)
- WiMAX(802.16)
- Third generation or 3Gcellular wireless.
The most widely used wireless links today are usually asymmetric, that is, the two endpoints are usually different kinds of nodes.BASE STATION, usually has no mobility, but has a wired (or at least high bandwidth) connection to the internet or other networks.
A “client node” is often mobile, and relies on its link to the base station for all its communication with other nodes. Wireless communication naturally supports point to multipoint communication, because radio waves sent by one device can be simultaneously received by many devices. However, it is often useful to create a point to point link abstraction for higher layer protocols.This topology implies three qualitatively different levels of mobility. The first level is no mobility, such as when a receiver must be in a fixed location to receive a directional transmission from the base station, as is the case with the initial version of WiMAX.
The second level is mobility within the range of a base, as is the case with Bluetooth. The third level is mobility between bases, as is the case with cell phones and Wi-Fi.
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FAQs on Wireless LAN’s - Computer Networks - Computer Science Engineering (CSE)
| 1. What is a wireless LAN? |  |
Ans. A wireless LAN (Local Area Network) is a type of computer network that allows devices to connect and communicate wirelessly using radio waves instead of physical cables. It enables users to access the internet, share files, and connect to other devices within a specific area.
| 2. How does a wireless LAN work? | |
Ans. A wireless LAN works by using a wireless access point (AP) that connects to the wired network. The AP acts as a central hub, transmitting and receiving data between wireless devices and the wired network. When a device wants to communicate, it sends data packets over the air using radio frequencies. The AP receives these packets and forwards them to the appropriate destination within the network.
| 3. What are the advantages of using a wireless LAN? | |
Ans. Some advantages of using a wireless LAN include:
- Mobility: Users can connect to the network from anywhere within the coverage area, allowing for greater flexibility and convenience.
- Cost savings: Installing and maintaining physical cables can be expensive, while wireless LANs eliminate the need for extensive wiring.
- Scalability: Wireless LANs can easily accommodate new devices without the need for additional cabling or infrastructure.
- Accessibility: Multiple devices can connect to the network simultaneously, enabling easy collaboration and resource sharing.
- Ease of installation: Setting up a wireless LAN requires minimal physical configuration compared to wired networks.
| 4. What are the security considerations for wireless LANs? | |
Ans. Security is a crucial aspect of wireless LANs. Some important security considerations include:
- Encryption: Implementing encryption protocols such as WPA2 or WPA3 helps protect data transmitted over the wireless network from unauthorized access.
- Authentication: Using strong passwords and implementing authentication methods like WPA-Enterprise or 802.1X ensures that only authorized users can access the network.
- Access control: Configuring access control lists (ACLs) or MAC address filtering can restrict access to the wireless network to specific devices or users.
- Firewall and Intrusion Detection/Prevention Systems: Deploying these security measures helps monitor and prevent unauthorized access or malicious activities within the wireless LAN.
| 5. What are the potential limitations of wireless LANs? | |
Ans. While wireless LANs offer numerous advantages, they also have some limitations, including:
- Range: The coverage area of a wireless LAN is limited, and obstacles such as walls and interference from other devices can further reduce the effective range.
- Interference: Other wireless devices operating on similar frequencies, such as Bluetooth devices or microwave ovens, can cause interference and degrade the performance of a wireless LAN.
- Bandwidth limitations: Wireless LANs generally have lower data transfer rates compared to wired networks, especially in crowded environments with multiple connected devices.
- Security vulnerabilities: Wireless LANs are susceptible to security breaches if not properly secured, making them potential targets for unauthorized access or data interception.
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