JN0-650 Exam Dumps | Which two statements are correct when using the no-loss forwarding class? (Choose two.)

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Juniper.JN0-650.v2026-06-22.q33
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Question 31/33

Which two statements are correct when using the no-loss forwarding class? (Choose two.)

A. Use the default scheduler map

B. Use forwarding class sets.

C. Use priority-based flow control.

D. Use the default drop profile.

Correct Answer: B,C

In Junos OS 24.4, the no-loss forwarding class is used for traffic that requires lossless delivery, such as iSCSI or FCoE, typically in a Data Center Bridging (DCB) environment.
* Priority-Based Flow Control (Option C): To guarantee "no-loss" behavior, the switch must support and use Priority-based Flow Control (PFC). PFC allows the switch to send "pause" frames for a specific priority (forwarding class) to prevent buffer overflow and packet drops without affecting other traffic on the same link.
* Forwarding Class Sets (Option B): In enhanced Layer 2 software (ELS) versions used by modern QFX and EX series switches, lossless traffic must be managed within forwarding class sets (also known as priority groups). This grouping is necessary to apply specific DCB properties, such as PFC and specific bandwidth guarantees, to the lossless traffic class.
* Why A and D are incorrect: Default scheduler maps and default drop profiles do not provide the specialized buffer management or lossless signaling required for this class. Lossless traffic specifically requires the suppression of tail drops rather than standard drop profiles.

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