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802.11a: Frequency Band: 5 GHz band. Maximum Data Rate: Up to 54 Mbps. Modulation: OFDM (Orthogonal Frequency Division Multiplexing). Advantages: High data rate for its time. Reduced interference in the 5 GHz band. Suitable for applications requiring high bandwidth but with shorter range.  802.11b: Frequency Band: 2.4 GHz band. Maximum Data Rate: Up to 11 Mbps. Modulation: DSSS (Direct-Sequence Spread Spectrum). Advantages: Widely adopted due to affordability. Compatible with legacy devices. Suitable for basic internet access. 802.11g: Frequency Band: 2.4 GHz band. Maximum Data Rate: Up to 54 Mbps. Modulation: OFDM and DSSS. Advantages: Improved data rates compared to 802.11b. Backward compatible with 802.11b devices. Still used in legacy networks. 802.11n: Frequency Band: 2.4 GHz and 5 GHz bands. Maximum Data Rate: Up to 600 Mbps (with multiple spatial streams). Modulation: OFDM with MIMO (Multiple-Input, Multiple-Output). Advantages: Introduced MIMO technology for improved range ...

Nginx (pronounced "engine-x") is a high-performance, open-source web server and reverse proxy server software. It's designed to handle tasks related to serving web content, load balancing, and acting as a reverse proxy for various internet services. Originally created by Igor Sysoev in 2004, Nginx has gained widespread popularity due to its efficiency, scalability, and robust features. Here are some key features and use cases for Nginx: Web Server: Nginx can serve static content like HTML, CSS, JavaScript, and images efficiently. It can also be configured to serve dynamic content through various programming languages and frameworks. Reverse Proxy: Nginx is often used as a reverse proxy server to distribute incoming web traffic to multiple backend servers or application instances. This helps distribute the load, improve performance, and enhance security. Load Balancer: Nginx can function as a load balancer to evenly distribute incoming requests among multiple backend ser...