Cisco Certified Network Associate (CCNA) Practice Exam

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Prepare for the CCNA Exam with detailed questions and thorough study materials. Each question is accompanied by hints and explanations to facilitate your learning process. Get ready to ace the CCNA Exam!

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How far can the 1000BASE-ZX standard reach?

10 km
400 meters
100 km
3 km

The correct answer is: 100 km

The 1000BASE-ZX standard, which is part of the Gigabit Ethernet specification, is designed for long-distance transmission over single-mode fiber optics. Its maximum reach is up to 100 kilometers, making it suitable for connecting networks across large distances without needing repeaters or amplifiers. This extended range is particularly beneficial for telecommunications and large enterprise networks where long-distance fiber runs are common. The standard utilizes a wavelength of 1550 nm, which allows effective transmission over this distance while minimizing signal loss and dispersion, ensuring high-quality data communication. This capability is fundamental for applications that require reliable connectivity across great distances, such as inter-building connections in a campus environment or connections between different data centers.