00:00When building a network, two questions matter most. How easily can it grow and how likely is
00:06it to fail? These are known as scalability and reliability. The topology you choose,
00:11the physical or logical layout of your devices, will define both. Let's see how the most common
00:17topologies stack up. Star topology is moderately scalable. You can add new employees' computers
00:24simply by connecting them to the central switch. However, that switch is a potential bottleneck.
00:30If it reaches capacity, growth stops. In terms of reliability, it's quite strong. If one cable
00:36or device fails, only that device loses its connection. But beware, if the central switch
00:42fails, the entire network goes dark. Bus topology is not highly scalable. Adding more devices leads
00:49to signal degradation as electrical signals must travel the entire length of the bus. It's also
00:54less reliable. Because there is only one main path, a single break in that cable can disrupt
00:59the entire network. This is why older Ethernet networks that use this layout required signal
01:05repeaters just to stay functional.
01:06Ring topology is moderately scalable. But adding nodes becomes complex as the network grows. However,
01:13it can be highly reliable. Especially if data can travel in both directions. In a token ring network, if
01:20one device fails, the rest can often continue to communicate. Though a cable segment failure might still
01:25disrupt the entire ring. If you want high scalability, mesh is the answer. Devices can be added with ease,
01:32and multiple paths reduce congestion. It is also highly reliable. The redundancy of multiple paths
01:39ensures that if one route fails, data takes an alternative route, minimizing downtime. This is why
01:45large data centers and cloud networks rely on mesh topologies. Finally, hybrid topologies can be highly
01:51scalable by combining the strengths of multiple layouts. Their reliability varies based on the
01:56components. For example, a large enterprise might use a star topology for easy management and office
02:02branches, combined with a mesh topology in their data centers for maximum redundancy. There is no perfect
02:08topology, only the one that fits your needs for growth and stability. Did this help you understand network
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