100 meters
The maximum segment length specified by the 1000BASE-T standard is 100 meters (328 feet) when using Category 5e (Cat 5e) or higher unshielded twisted pair (UTP) cabling. This length includes the total length of the cable run from the switch or router to the endpoint device, accounting for any patch cables used in the installation.
2.5 kilometers
There is no reason that the length of a line segment can't be measured.There is no reason that the length of a line segment can't be measured.There is no reason that the length of a line segment can't be measured.There is no reason that the length of a line segment can't be measured.
The definition for length of segment is the distance between the endpoints of s segment
The maximum allowable segment length on a 1000BASE-T network is 100 meters (328 feet) for the twisted-pair cabling, which typically uses Category 5e or Category 6 cables. This length includes any patch cables and horizontal cabling between the network devices. Exceeding this distance can result in signal degradation and performance issues.
The maximum segment length specified by the 1000BASE-T standard is 100 meters (328 feet) when using Category 5e (Cat 5e) or higher unshielded twisted pair (UTP) cabling. This length includes the total length of the cable run from the switch or router to the endpoint device, accounting for any patch cables used in the installation.
2.5 kilometers
It is true. The book says "The maximum distance a signal can travel and still be interpreted accurately is equal to a segment's maximum length. Beyond this length, data loss is apt to occur."
For a single link the maximum is 100 meters.
40 km
The signal can only be sent so far before becoming distorted
For any Cat 5 cable, the maximum segment length is 100 meters per segment.
For use in networks the maximum segment length would be 500 meters
1000 base‑lx
Most UTP cable is limited to 100 meters.
Category 6
10 Mbps