SG0-001 · Question #75
When enabling Jumbo Frames for iSCSI operations, which of the following is true?
The correct answer is D. Must be supported end to end or performance problems in the network may occur.. For Jumbo Frames to function correctly and avoid performance issues in an iSCSI network, every device along the entire data path must support and be configured for them.
Question
When enabling Jumbo Frames for iSCSI operations, which of the following is true?
Options
- AIt is a tunneling feature and only needs to be supported at the endpoints.
- BIt is incompatible with IPSec due to encryption functionality.
- CRecommended size for Jumbo is 64K, which is max size of a SCSI packet.
- DMust be supported end to end or performance problems in the network may occur.
How the community answered
(34 responses)- A3% (1)
- B6% (2)
- C3% (1)
- D88% (30)
Why each option
For Jumbo Frames to function correctly and avoid performance issues in an iSCSI network, every device along the entire data path must support and be configured for them.
Jumbo Frames are not a tunneling feature; they simply allow larger Ethernet frames, and they must be supported by all devices in the path, not just endpoints.
Jumbo Frames are compatible with IPSec, as IPSec operates at a layer above Ethernet frame size considerations.
The recommended size for Jumbo Frames is typically around 9000 bytes (e.g., 9014 or 9216 bytes), not 64K, and 64K is not the maximum size of a SCSI packet.
Jumbo Frames require end-to-end support across the entire network path, including initiators, targets, and all intermediate switches. If any device in the path does not support or is not configured for Jumbo Frames, packets will be fragmented, leading to increased CPU overhead and reduced performance.
Concept tested: Jumbo Frames configuration for iSCSI
Source: https://learn.microsoft.com/en-us/windows-server/administration/performance-tuning/subsystem/network-tuning#jumbo-frames
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