CCNA: Cisco Certified Network Associate — Question 1342

What is the difference between 1000BASE-LX/LH and 1000BASE-ZX interfaces?

Answer options

• A. 1000BASE-LX/LH interoperates with multimode and single-mode fiber, and 1000BASE-ZX needs a conditioning patch cable with multimode.
• B. 1000BASE-ZX interoperates with dual-rate 100M/1G 10Km SFP over multimode fiber, and 1000BASE-LX/LH supports only single-rate
• C. 1000BASE-ZX is supported on links up to 1000km, and 1000BASE-LX/LH operates over links up to 70 km
• D. 1000BASE- LX/LH is supported on links up to 10km, and 1000Base-ZX operates over links up to 70 km

Correct answer: D

Explanation

The correct answer is D because 1000BASE-LX/LH is indeed designed for distances up to 10km, while 1000BASE-ZX can reach up to 70 km. Options A, B, and C are incorrect as they misrepresent the specifications and capabilities of the interfaces in question.