SG0-001 · Question #591
Which of the following are the MOST important properties to remember when replacing a faulty SFP? (Select TWO).
The correct answer is B. Distance rating C. Port speed. When replacing a faulty SFP, the most important properties to match are the distance rating for the fiber optic link and the port speed to ensure compatibility and proper network function.
Question
Which of the following are the MOST important properties to remember when replacing a faulty SFP? (Select TWO).
Options
- ASFP TX power
- BDistance rating
- CPort speed
- DSFP RX power
- EDriver version
How the community answered
(22 responses)- B86% (19)
- D5% (1)
- E9% (2)
Why each option
When replacing a faulty SFP, the most important properties to match are the distance rating for the fiber optic link and the port speed to ensure compatibility and proper network function.
SFP TX (transmit) power is an internal characteristic determined by the SFP's design for a given distance and speed, not a primary property an administrator selects when replacing the module.
The distance rating of the SFP must match or exceed the required cable length for the link, as different SFP types are specifically designed for various transmission distances (e.g., short-reach, long-reach).
The SFP's port speed must match the speed of the port it's inserted into and the speed of the corresponding port on the other end of the link (e.g., 1Gbps, 10Gbps, 25Gbps). Mismatched speeds will prevent the link from establishing or functioning correctly.
SFP RX (receive) power is a diagnostic measurement of the incoming optical signal strength, not a configurable or selection property when choosing a replacement SFP.
SFPs are hardware modules and do not require specific 'driver versions' in the software sense; their compatibility is governed by their physical specifications, speed, and distance capabilities.
Concept tested: SFP module compatibility and selection
Source: https://www.cisco.com/c/en/us/support/interfaces-modules/transceiver-modules/products-compatibility-information.html
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