What is the maximum length of an Ethernet UTP cable?

The maximum length of an Ethernet UTP (Unshielded Twisted Pair) cable, specifically for common standards such as 10BASE-T and 100BASE-TX (Fast Ethernet), is indeed 100 meters. This length is established to ensure reliable transmission signals, minimizing the effects of attenuation and interference.

Within this 100-meter limit, the cable can operate effectively, allowing for a proper signal journey between devices such as switches and computers. Using lengths greater than 100 meters can lead to degraded signal quality, increased packet loss, and connectivity issues, which is why this specification is critical for network design.

Shorter lengths, such as those suggested in some incorrect options, do not adhere to the standard Ethernet cable specifications for typical network environments, which is why they are not considered the maximum permissible length.