Examples of Existing Networks

Some of the prominently used networks in today's world are examples that showcase different networking technologies and their applications in various domains.

Internet

The Internet is a global collection of interconnected networks that use the TCP/IP protocol suite to communicate. It represents the largest wide area network, connecting billions of devices worldwide through a decentralized architecture.

The Internet encompasses private, public, academic, commercial, and government networks, but no single organization controls it entirely. This distributed control model ensures resilience and global accessibility.

Traditional Internet services include email, file transfer, and web browsing. Modern applications have expanded to include voice over IP, streaming media, cloud computing, e-commerce, social networking, and Internet of Things (IoT) applications.

IEEE 802.11 for Wireless LAN

IEEE 802.11 is the standard defining wireless local area networks (WLANs). It specifies both Media Access Control (MAC) and Physical layer protocols operating in unlicensed frequency bands including 2.4 GHz and 5 GHz.

The 802.11 architecture consists of Access Points (APs) that serve as wireless base stations and client devices such as laptops, smartphones, and tablets. This infrastructure enables mobility within the coverage area while maintaining network connectivity.

Key 802.11 Standards

RFID and Wireless Sensor Networks

Radio Frequency Identification (RFID) uses radio waves to automatically identify and track tags attached to objects. RFID systems consist of tags containing electronically stored information and readers that capture data from tags within range.

Wireless Sensor Networks (WSN) comprise spatially distributed sensor nodes that monitor environmental conditions such as temperature, humidity, pressure, or motion. These networks collect data autonomously and transmit it to central processing systems.

The integration of RFID with WSN extends coverage areas to 100-200 meters through multi-hop communication. This hybrid approach enables applications in asset tracking, environmental monitoring, supply chain management, and smart city infrastructure.

Conclusion

These network examples demonstrate the diversity of modern networking technologies, from the global Internet using TCP/IP, to wireless LANs enabling local mobility, to specialized networks like RFID/WSN for tracking and sensing applications.