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The maximum cable segment length allowed for a network using the 1000Base-T specifications is 100 meters. This standard is designed for Gigabit Ethernet over twisted-pair cabling, specifically using Category 5e or better, which enables reliable data transmission at high speeds.

The 100-meter limit includes the entire length of the horizontal cabling from the switch (or other networking devices) to the end device, such as a computer, and it encompasses all patch cables and connections in that segment. This length ensures that the integrity of the signal is maintained, allowing for optimal performance and minimal packet loss.

In contrast, the other lengths provided are not consistent with 1000Base-T specifications. Although 50 meters is commonly associated with other types of networks — like some Fast Ethernet standards — lengths of 150 meters or 200 meters exceed the capabilities established for 1000Base-T, affecting the network's reliability and performance. Therefore, the 100-meter maximum is a critical standard for maintaining effective Gigabit Ethernet operations.