GSEC Question #356: Real Exam Question with Answer & Explanation

The correct answer is A. 100 meters. 1000BaseT (Gigabit Ethernet over twisted-pair copper cabling) follows the standard Ethernet twisted-pair segment length limit of 100 meters. This applies to Cat5e or Cat6 cabling under IEEE 802.3ab.

Question

You work as a Network Administrator for Perfect World Inc. You are configuring a network that will include 1000BaseT network interface cards in servers and client computers. What is the maximum segment length that a 1000BaseT network supports?

Options

A100 meters
B480 meters
C1000 meters
D10 meters

Explanation

1000BaseT (Gigabit Ethernet over twisted-pair copper cabling) follows the standard Ethernet twisted-pair segment length limit of 100 meters. This applies to Cat5e or Cat6 cabling under IEEE 802.3ab.

Common mistakes.

B. 480 meters is not a valid maximum segment length for any standard Ethernet twisted-pair specification.
C. 1000 meters is associated with fiber-optic Ethernet standards such as 1000BaseLX, not copper twisted-pair 1000BaseT.
D. 10 meters has no basis in 1000BaseT specifications and would be an impractically short segment length for a campus or enterprise network.

Concept tested. 1000BaseT maximum segment length per IEEE 802.3ab

Reference. https://standards.ieee.org/ieee/802.3ab/1156/

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