Networks Study Guide

Computer networks are systems where multiple computing devices, such as desktop computers, laptops, servers, and embedded systems, are interconnected. This interconnection allows these devices to exchange data and share resources efficiently. The fundamental reasons for connecting computers in a network revolve around facilitating communication, sharing hardware peripherals and software applications, centralising data management, and enabling collaborative work. Without networks, each computer would operate in isolation, leading to redundant resources, logistical challenges in data transfer, and significant limitations on information access and teamwork. Networks enable users to access information from various locations, communicate instantaneously, and collectively work on projects, thereby enhancing productivity and reducing operational costs. This interconnectedness is integral to modern computing environments, from small home setups to vast global infrastructures like the internet.

The choice between wired and wireless connectivity significantly impacts network performance across several key characteristics: speed, range, latency, and bandwidth. Wired connections, typically using Ethernet cables, generally offer higher data transfer speeds and more consistent bandwidth because the signal travels directly through a dedicated cable, reducing interference and signal loss. This direct path also contributes to lower latency, meaning data travels from source to destination with minimal delay. However, wired connections are limited by the physical length of cables and require infrastructure planning, restricting mobility.

Wireless connections, operating over radio waves, provide greater flexibility and mobility but often come with trade-offs in performance. Speeds can be lower and less consistent than wired connections due to factors like signal obstruction (walls, furniture), interference from other wireless devices, and the shared nature of the airwave medium. Range is also a characteristic; wireless signals degrade with distance, leading to slower speeds and potential dead zones. Latency tends to be higher in wireless networks due to signal processing, retransmissions, and the overhead of managing connections over the air. While theoretical bandwidths for wireless standards are increasing, the effective bandwidth in real-world scenarios is often lower and more variable compared to a dedicated wired link.